Replace the underlined parts of the sentences with infinitive phrase.
A: He is so busy that he can’t answer your call. He is too busy to answer your call.
1. She is so weak that she can’t go out.
2. They will be so busy that will not meet you at the station.
3. This cat is so fat that it can’t catch a mouse.
4. The game was so boring that we didn’t want to play it.
5. This story was so unbelievable that we didn’t believe him.
6. The weather is so hot that we will not leave the house.
7. That bar was so dirty that nobody wanted to eat there.
8. The water is so cold that I don’t want to swim in the river.
9. He is so stupid that can’t learn a single thing.
10. She had very little money and she couldn’t buy a dress.
B: He has a lot of books which he can read. He has a lot of books to read.
1. I would like to offer you the dress which you can buy.
2. Have you chosen the project of the house which you will build?
3. Is there something which you can show us?
4. Here is a man who will do this work.
5. Could you give me a book which I can read?
6. Jack’s brought us a new film which we can see.
7. They have a lot of work which they must finish in time.
8. She has less time in which she will tell you everything.
9. Here is an interesting physical process which we can study.
10. Mother bought a lot of fruit which we can eat.

1. She is so weak that she can’t go out.
She is too weak to go out.

To form an infinitive phrase, we use the base form of the verb preceded by "to." In this case, the verb "go" is changed to "to go" to create the infinitive phrase "to go out."

2. They will be so busy that will not meet you at the station.
They will be too busy to meet you at the station.

Again, the base form of the verb "meet" is changed to "to meet" to form the infinitive phrase "to meet you at the station."

3. This cat is so fat that it can’t catch a mouse.
This cat is too fat to catch a mouse.

The verb "catch" is changed to "to catch" to form the infinitive phrase "to catch a mouse."

4. The game was so boring that we didn’t want to play it.
The game was too boring to play.

The verb "play" is changed to "to play" to form the infinitive phrase "to play it."

5. This story was so unbelievable that we didn’t believe him.
This story was too unbelievable to believe him.

The verb "believe" is changed to "to believe" to form the infinitive phrase "to believe him."

6. The weather is so hot that we will not leave the house.
The weather is too hot to leave the house.

The verb "leave" is changed to "to leave" to form the infinitive phrase "to leave the house."

7. That bar was so dirty that nobody wanted to eat there.
That bar was too dirty to eat there.

The verb "eat" is changed to "to eat" to form the infinitive phrase "to eat there."

8. The water is so cold that I don’t want to swim in the river.
The water is too cold to swim in the river.

The verb "swim" is changed to "to swim" to form the infinitive phrase "to swim in the river."

9. He is so stupid that can’t learn a single thing.
He is too stupid to learn a single thing.

The verb "learn" is changed to "to learn" to form the infinitive phrase "to learn a single thing."

10. She had very little money and she couldn’t buy a dress.
She had very little money and she couldn’t afford to buy a dress.

In this case, the phrase "buy a dress" is replaced with the phrase "afford to buy a dress," which is an equivalent infinitive phrase.