I ask her （if）I could help her.为什么用If

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I ask her （if）I could help her.为什么用If
She （invited）me to her birthday party.为什么invite要用ed?

1.if或whether都可以.连词,连接从句,同时表示选择的意义.
if I could help her是从句,意思是是否我能帮助她.
2.应为是这个邀请的动作是过去发生的,所以用过去时.

I ask her （if）I could help her.为什么用If I asked her if I could help her If I leave,whether can you ask her to stay? I"ll ask her if she ___ here.为什么是 will come 而不是comes If i find her if i just 请问If I choose to leave whether can you ask her her to elsa__several companies to ask if they could offer her part I wonder if he （）ask his brother for help. 14.I am sure he will help her if he _____ her.A knows B will i won't give it to her,if she doesn't ask for it.(同义句） i won "if I need to help ,I will ask they for help "有什么地方错了,为什么? If I had got there earlier,I should/could have met her.