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一般過去時(shí)的構(gòu)成及用法
一般過去時(shí)表示過去的動(dòng)作或過去存在的狀態(tài)，由動(dòng)詞的過去式構(gòu)成。動(dòng)詞be的過去式為was/were， have的過去式為had. 除不規(guī)則動(dòng)詞外，其他動(dòng)詞的一般過去式通常都是在詞尾加-ed.
規(guī)則動(dòng)詞的過去式規(guī)則
1.大部分在詞尾直接加-ed
mend-mended wait-waited
talk-talked discuss-discussed
2.以-e 結(jié)尾的動(dòng)詞，詞尾只加-d
replace-replaced assemble-assembled
phone-phoned advise-advised
3.以重讀閉音節(jié)結(jié)尾的動(dòng)詞，雙寫詞尾的輔音
后，再加-ed
fit-fitted stop-stopped
occur-occurred stab-stabbed
4.以輔音字母+y結(jié)尾的動(dòng)詞，先將y變?yōu)閕，再加-ed
try-tried occupy-occupied
5.以-ic 結(jié)尾的動(dòng)詞，先在詞尾加K，再加-ed
picnic-picnicked traffic-trafficked
一般過去時(shí)的用法
1.表示過去某一確定時(shí)間發(fā)生的動(dòng)作或存在的狀態(tài)，可能是一次性的，也可能是過去經(jīng)常反復(fù)發(fā)生的，常與表示過去時(shí)間的狀語連用.
He lost his purse yesterday.
It was very cold last night
Last year we were rather busy.
When he was a child，he observed things carefully.
He always got up too late， and never had enough time for breakfast.
2.用于虛擬語氣中，表示對現(xiàn)在或?qū)淼募僭O(shè)，主觀意圖或愿望等.
I wish l had your brains， I＇m too stupid.
3.在時(shí)間、條件狀語從句中，常用一般過去時(shí)代替過去將來時(shí)，表示過去將來的動(dòng)作。
They said they would let us know if they heard any news about him.