一、缺一介词

① 有些动词后有时有介词，有时没有介词，可能混淆而缺一介词。如：attend a meeting, 但 attend ∧(to) the patient; prepare breakfast, 但 prepare∧ (for) the exam; join us, 但 join∧(in) a game.

② 表语形容词通常具有动词意义，很可能误以为是动词而漏掉介词。如：be afraid ∧(of) nothing, be present ∧(at) the meeting, be sure ∧(about) it。

③ except, instead of, from, since, till, until 后面可跟另一介词词组充当介词宾语，可能会漏掉第 2 个介词。如：

He came on foot instead of ∧ (by) bike.

A big bear ran out from ∧ (behind) a tree.

④ hundreds, thousands 等后面可能漏掉 of。类似的还有millions ∧ (of), dozens ∧ (of), scores ∧ (of)

二、缺一连词

① 汉语常用意合法，分句与分句之间往往不用连词，但英语里不行。如：

It began to rain, ∧ (and) they had to stop the match. (如果中间用分号可不用连词)

It was late, ∧ (so) we went home.

You like sports, ∧ (while) I’d rather read.

He looked for the key, ∧ (but) didn’t find it.

② 受汉语影响，并列动词词组之间可能缺一个and。如：

She smiled ∧ (and) said good-bye to her father.

③ 名词性从句 that分句置于句首或作同位语时不可缺少连词。如：

∧ (That) she is beautiful is known to us all.

We heard the news ∧ (that) our team had won.

④ even 后可能缺少 if 或 though。如：

He walks as ∧ (if 或 though) he were drunk.