句中的am为什么不用was呢I cried because I am scard .am为什么不用was呢?

句中的am为什么不用was呢I cried because I am scard .am为什么不用was呢? I was supposed to take care of him.为什么这句话要用was 不用am呢? When i am middle aged.为什么不用middle age呢? I saw her play the violin when i was eight上句中的play为什么不用played? i am sorry for what i have said为什么不用was?i am sorry for what i said为什么不用was？ I was just thinking.意思是我在想点事.为什么用was不用am? 为什么 if i were a boy 中的were 不用was? 为什么If only I were abird.中的were不用was 为什么用whom 而不用who在句子I am sorry whom your handbag was stolen中,为什么不用who I like to have someone to play with.句中的with不是介词吗,后面为什么不用放宾语呢? i was at home last night.这事一个过去时态的句子.这里为什么不用were 呢,我记得过去时am变成were 而is 变成was啊这里明显i后面填were啊请求帮助 i am excited 为什么不用exciting I am queen.为什么不用加a? i was playing the piano 和i am playing the piano 第一句成立吗 第二句呢 Sorry,I have no enough money now.为什么用 have,而不用am having呢? 麻烦英文帝帮我解释一下这句英文中的一个语法问题Mr．Gilbert said he was inquiring about a certain patient为什么用 was inquiring呢?如果换成直述的Mr．Gilbert said “I am inquiring about a certain patient”也说不 一个简单句子中的英语语法I was unaware of the danger为什么不用I was unawaring the danger? he did not understand English.句中的为什么用did 而不用was?