Câu điều kiện loại 2: 1/ I don’t know what to say to her. ` -> ` What 2/ They are too old to take part in the social activ

Câu điều kiện loại 2:
1/ I don’t know what to say to her.
` -> ` What
2/ They are too old to take part in the social activities.
` -> ` If they
3/ I find it difficult for me to read the letter because it is very dark.
`-> `Unless



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