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一般過去時常與表示具體的過去時間的狀語 ( 如 yesterday,last week,three days ago,in 1990等 )連用 。現(xiàn)在完成時不與表示明確的過去時間的狀語連用 ,但可以與 in the past...years/weeks,so far等時間狀語連用。例如 : Tom wrote a letter to his parents last 。 The weather has been so hot so far this ,今年夏天天氣一直很熱。 Ⅰ .根據(jù)句意用所給詞的適當(dāng)形式填空 have already had had it at 11:30.( have ) 2.— Have you written to your parents yet? —Yes,I wrote to them last night.( write ) 3.—How clean the classroom is! —Yes,I’m sure that someone has cleaned ( clean ) it. started ( start ) to write the letter yesterday,but he hasn’t finishe