一般过去时 （用did, was等）
I did not recieve his reply.
现在完成时 （用have(has)+过去分词）
I still have not received his reply.
或
I have not received his reply yet.
书写一般不用缩写didn't 和havn't，用did not和have not。
一般过去时: I did not receive his reply yet.
现在完成时: I have not received his reply yet.
I didn't get his reply till the end.
I haven't had his reply yet.
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