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after可用作：
介词，后面跟名词、代词或动名词：
Let’s talk about it after dinner. 咱们吃完晚饭再谈这事。
She felt much better after taking the medicine. 吃完药后她感觉好多了。
连词，引导状语从句：
After we had finished the work we had a little rest. 干完活后我们休息了一会儿。
副词：
A moment after there was a knock at his door. 过了一会儿有人敲他的门。
afterwards（美式英语为afterward）为副词，表示“在这之后”“后来”等：
Afterward they had lunch in the garden. 在这之后他们在花园里吃了午饭。