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make sure后接to do还是do

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make sure后接to do还是do
make sure to do毫无疑问是正确的.
但是推荐答案中的第二种提法有点危险,很容易让人把do sth当成省略to的不定式作宾补.
其实 完整的说法应该是make sure (that)sb does sth.that常省略,宾语从句中的谓语do有人称、数和时态的变化.
但是要注意,make sure后宾语从句中的时态常不用将来时.如:
Please make sure that the door is locked.请弄准门确实是锁好了.
Are you willing to be a guarantee of your friend's good behaviour,ie undertake to make sure that he behaves himself properly?你愿担保你朋友品行良好吗?