must + have done ; can + have done; should +have done ; ought to + have done ; 3.此句中 be supposed to 表示被看作是… 例: Cats are supposed to have nine lives. 猫被认为有九条生命。 4.grow up:兴起,逐渐形成 例: New cities grow up into desert.新的城市...
常见的半助动词有be about to,be due to,be going to,be likely to,bemeant to,be obliged to,be supposed to,be willing to,have to,seem to,be unable to,be wiling to等 ⑵ 情态助动...
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