1. my book bacame a best seller .it was published last year ( mệnh đề quan hệ)
2. the man was very helpful .He spoke to me ( mệnh đề quan hệ )
3. he lose his job because he is late every day (conditional sentence )
4. we don't know his number, so we don't call him ( câu if)
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Sinh Học lớp 12
