1. 看句子中有没有be (is/am/are...)或情态动词(can/will...)、助动词have/has/had (have /has/had done结构中或英国人表示有之意)，有的话直接在其后加not。如 He is （not）a student. He can (not) swim. He has (not) been there.

2.若没有，则要在动词前加don't/doesn't/didn't(具体用哪个要看情况，第三人称单数用doesn't，过去式用didn't),特别注意加了以后，后面的动词都要用原形，如 He works here.--he doesn't work here. he worked here.--he didn't work here.

3. 祈使句直接在句首加don't,如：Open the door.--Don't open the door. --Be early! = Don't be late!

另外还要注意： some 要变为any.。暂时只想到这些。打字好辛苦！

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