关于第二册的新概念英语课后练习及语法总结

英语时态是英语语法中的第一道难关，攻下此难关是作文、阅读、口语之关键。汉语用不同词表达相应时态，而英语用同一词的不同变化形式表达时态。

英语各种时态构成表，以play为例：

一般时态进行时态完成时态完成进行时态现在play llaysis am playing arehas have playedhas have been playing过去playewas were playinghad playedhad been playing将来shall will playshall will be playingshall will have playedshall will have been playing过去

将来should

would playshould

would be playingshould

would have playedshould

would have been playing