If he wrote to her, she would be happy.
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When he wrote to her, she wasn’t happy.
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May be he’ll write to her, and then she’ll be happy.
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He doesn’t write to her, so she isn’t happy.
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She’s happy because he has written to her.
Đáp án: He doesn’t write to her, so she isn’t happy.
Giải thích: Nghĩa của câu: Nếu anh ấy viết thư cho cô ấy, cô ấy sẽ rất hạnh phúc.
Nghĩa hợp với nghĩa câu “He doesn’t write to her, so she isn’t happy”: Anh ấy không viết cho cô ấy, nên cô ấy không vui.