【 Native Camp 】SIDE by SIDE 4 page24-27

RULE: In its present tense form, MUST has two meanings: (1) strong obligation and (2) strong probability, but in the past, it expresses only a strong probability. The past form of the modal MUST is MUST HAVE + the past participle. It is used to express a probability about the past.
ルール：現在形では、MUSTには2つの意味があります。（1）強い義務と（2）強い確率ですが、過去には、強い確率しか表現していませんでした。 形式上 MUSTの過去形は、MUST HAVE +過去分詞です。 過去についての確率を表すために使用されます。
※ obligation 義務 / probability 義務 / modal 形式上

I'm a Little Concerned
私は少し心配です

I must have eaten 食べたに違いない
I might have eaten 食べたかもしれない
I may have eaten 食べたかもしれない

For example
A. Timmy looks frightened！ He must  have seen a scary movie today.
ティミーは怯えてるように見えます。彼は今日怖い映画をみたに違いありません

B. I'm not so sure. He might have / may have seen a scary movie , but that doesn't usually make him so frightened.
私はそうは思わない。彼は怖い映画を観たかもしれない、しかし普段はそれで彼をそれほど怖がらせることはありません。

A. I'm a little concerned. Maybe we should talk to him.
私は少し心配です。多分私達は彼と話すべきです。

B. That's good idea.
それはよい考えです。

For example(2)
A . Janet looks tired！ She must have worked overtime today.
ジャネットは疲れてるように見えます。彼女は今日仕事で残業したに違いない。

B. I'm not sure. She might have / may have worked overtime , but that doesn't usually make her so tired.
私はそうは思いません。彼女右派仕事で残業したかもしれないですが、普段はそれで彼女をそれほど疲れさせることはありません。

A. I'm a little concerned. Maybe we should talk to her .
私は少し心配です。多分私達は彼女と話すべきです。

B. That's good idea.
それは良い考えです

1. 
Mr. Jenkins looks exhausted. She must have swum fifty laps.
I'm not sure. He might have / may have swum fifty laps , but That's doesn't usually make him so exhausted.
I'm a little concerned . Maybe we should talk to him.
That's good idea.
※ exhausted 疲れ果てた

2.
Rachel looks upset ！ She must have failed an exam.
I'm not sure. She might have / may have failed an exam , but That doesn't usually make him so upset.
I'm a little concerned. Maybe we should talk to her.
That's good idea.
※failed 失敗した

3.
Steven looks angry. He must have had a fight with his landlord.
I'm not sure. He might have / may have had a fight with his landlord , but That's doesn't usually make him so angry.
I'm a little concerned. Maybe we should talk to him.
That's good idea.

4.
Margaret looks tired. She must have jogged for a long time.
I'm not sure. She might have / may have jogged for a long time but That's doesn't usually make her so tired.
I'm a little concerned. Maybe we should talk to her.
That's good idea.

5.
Wayne looks upset. He must have had an argument with the boss.
I'm not sure. He might have / may have had an argument with the boss, but that doesn't usually make him so upset.
I'm a little concerned. Maybe we should talk to him.
That's good idea.
※argument 口論

6.
Our English teacher looks disappointed .She must have found a lot of mistakes in our homework.
I'm not sure. She might have may have found a lot of mistakes our homework, but that doesn't usually make her so disappointed.
I'm a little concerned. Maybe we should talk to her.
That's good idea.
※disappointed ガッカリした

7.
Rick looks exhausted. He must have done a lot of sit ups .
I'm not sure. He might have / may have done a lot of sit- ups but that doesn't make him so exhausted.  
I'm a little concerned. Maybe we should talk to him.
That's good idea.

8.
Senator  Wilson looks tired. She must have shaken a lot of hands.
I'm not sure. Shu might have / may have shaken a lot of hands but , that doesn't usually make her so tired.
I'm a little concerned. Maybe we should talk to her.
That's good idea.

I want to Apologize to You
お詫び申し上げます

A. I want to apologize to you.
お詫び申し上げます
B. What for?
何ですか?
A. You must have been very angry with me yesterday.
あなたは昨日私にとても怒ったに違いありません。
B.I don't understand. Why should I have been angry with you.
私は理解できない。なぜあなたに怒るべきたったのですか？
A. Don't you remember?  We had planned to see a movie yesterday , but I completely forgot.
覚えてませんか。私達は昨日映画を観る予定でしたが私は予定を忘れてました
B. Don't worry about it. Actually , I owe you an apology.
心配はありません。実は、お詫び申し上げます。
A. You do ? Why ?
あなたが？　なぜ？
B. I couldn't have seen a movie with you anyway. I had to take care of my little sister yesterday... and I completely forgot to tell you.
どちらにせよあなたと映画も観る事が出来なかったでしょう。私は昨日妹の面倒をみなければいけませんでした、そして私はあなたにそのことを話すのを完全に忘れていました。
A. That's okay. Maybe we can see a movie some other time.
大丈夫です。多分私達はいつか映画を観る事ができます。

1. I want to apologize to you.
What for?
You must have been very angry with yesterday.
I didn't understand . Why should I have been angry with you?
Don't you remember? We had planned to go to the beach yesterday , but I completely forgot.
Don't worry about it. Actually , I owe You an apology.
You do ? Why ?
I couldn't have gone to the beach with you anyway. I had to studied for my final exam yesterday.... and I completely forgot to tell you.
That's okay. Maybe we can go to the beach some other time.

2.
I want to a apologize to you
What for?
You must have been very angry with me yesterday.
I don't understand. Why should I have been angry with you?
Don't you remember? We had planned to have lunch yesterday, but I completely forgot.
Don't worry about it. Actually , I owe you an apology.
You do? Why.
I couldn't have had lunch with you anyway. I had to gone to an important meeting yesterday.... and I completely forgot to tell you.
That's okay. Maybe We can have lunch some other time.

3.
I want to apologize to you.
What for?
You must have been very angry with me yesterday.
I don't understand. Why should I have been angry with you?
Don't you remember? We had planned to tale a walk in the park yesterday, but I completely forgot.
Don't worry about it. Actually, I owe you an apology.
You do? Why?
I couldn't have taken a walk in the park with you anyway. I had to visited a friend in the hospital yesterday.... I completely forgot to tell you.
That's okay. Maybe we can visit a friend in the hospital.

4. original
I want to apologize to you.
What for?
You must have been very angry with me yesterday?
I don't understand. Why should I have been angry with you?
Don't you remember? We had planned to play soccer yesterday, but I completely forgot.
Don't worry about it. Actually, I owe You an apology.
You do? Why?
I couldn't have played soccer with you anyway . I had to gone Disney land yesterday. and I completely forgot to tell you.
That's okay. Maybe we can play soccer some other time.

How to say it Apologizing.
I want to apologize to you
あなたにお詫び申し上げます
I need to apologize to you
お詫びする必要があります
I owe you an apology
私はあなたに謝らなければならない
I apologize
私は謝る
I'm sorry
ごめんなさい