A2
S + must + V0 · S + have to / has to + V0 · S + had to + V0
must, have to và had to
Explanation
must không có dạng quá khứ, nên nói về sự bắt buộc đã qua thì phải dùng had to. Nhớ ba mức khác nhau: mustn't là cấm, don't have to là không bắt buộc, didn't have to là hồi đó không cần. Bẫy thường gặp: Quá khứ của must KHÔNG phải musted: I musted go ✗, I had to go ✓.
Examples
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Practice
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The grammar point “S + must + V0 · S + have to / has to + V0 · S + had to + V0” (must, have to và had to) is one of the key structures at CEFR 2. To use it fluently, you need to understand the contexts where it's used and practice regularly.
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