must 肯定、may 可能 大、might 小、may not 可能不 might not can't 不可能、couldn't + do(be) 现在或将来 have done 过去 (二)三级试题汇编 1、The house is dark; the Browns ___ to bed. A. may go B. should go C. should have gone D. must have gone 2、—...
2.if… if only… It’s not bother if you… 3. should have done… shouldn’t have done… could have done… 如果句中出现I should have done this,那么答案一定是I didn’t do this. 反之亦然。 4.must be… must have done…(表推测的为例外,它应该选与所听相同...
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