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front of\ in the front of 在 …… 的前面 鏈接 : There is a big tree _____________the classroom. And a teacher’s desk is _____________the classroom. in front of in the front of 前者是在某個整體外部的前面 ,后者是在某個整體內(nèi)部的前面 . in the tree/ on the tree 在樹上 前者是附著物在樹上 ,例如 。風(fēng)箏 .鳥等 ,后者是長在樹上 ,例如果實 ,樹葉等 . 鏈接 :There’re many oranges ____the tree, And some birds are _____the tree , too. on in I was just reading a book when she came into my room. Were you writing when the teacher came in? While Jim was mending his bike, Lin Tao came to see him. You can’t do your homework while you’re watching TV. , while辨析:“當(dāng) …… 時候” while引導(dǎo)的時間狀語從句多用進行時態(tài),而 when引導(dǎo)的時間狀語從句多用一般過去時態(tài)。 用 when 和 while 填空 1. _________ we visited the school, the children were playing games. 2. __________ Tom was cleaning his room, the telephone rang. Martin was talking on the phone, her sister walked in. When While While What was he doing when the teacher came in? He was …when the teacher came in. 構(gòu)成: was / were + 現(xiàn)在分詞 I was doing my homework then. 那時 ,我正在做作業(yè)。 用法 :表示在過去某一時間內(nèi)正在進行的動作。 She was writ