助动词何时用be何时用have

助动词何时用be何时用have 英语中,何时用助动词 不分倒装时何时用have何时用did 否定句中何时用be动词和助动词对于用法我不是太清楚,老是搞混. 何时用be away from ,何时用be far away from,be far from somebody was thought to do/ have done.句型中,何时用to do,何时have done 英语Be动词用法有点疑惑到底何时用Be动词,何时不用 何时用现在完成时,何时用一般过去式? weekend何时用单数何时用复数? 角动量何时用mlv何时用jw 何时用do/does/did提问 何时用have/has 提问?经常混乱,很痛苦. 杯酒释兵权,何时用这个词 fruit何时用复数 何时用持续性动词 中国何时用阿拉伯数字 复数何时用is 碱液罐何时投用? 新概念第二册第一课 i did not enjoy it.i did not enjoy it.可否这样——i am not enjoy it.何时用助动词do?何时用BE动词?何时要用宾语?i did not enjoy it.改成i was not enjoy it.是不是意思一样？