IF的用法比如——I dont know if he ( ),if he( ),I will call you.两个都填

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IF的用法
比如——I dont know if he ( ),if he( ),I will call you.两个都填come的适当形式……怎么填为什么?还有If there ( )no buying and selling animals,there( )no killing in nature.选填is和will be 怎么填为什么最好把用法详细一说

1 I don't know if he （will come）,if he（ comes）,I will call you.在这个句子中,come表示的都是将来的动作.第一个if引导的是宾语从句,所以用将来时.第二个if 引导的是条件状语从句,在条件状语从句和时间状语从句中,一般将来时用一般现在时表示,所以填comes.
2 If there (is) no buying and selling animals,there( will be )no killing in nature.

i dont know if he will come tomorrow / i dont know if he com 请说明为什么.i dont know if Peter （）tomorrow,if he （）,please call I will call you if he ( )this afternoon 英语翻译I don`t know if Jack【 will come】.If he 【comes】 ,call me, I am not sure if Tom ____ home.If he ___,I will call you. I dont't know if his uncle .I rhink he if it doesn't rain. don't know if he __.If he__,I will tell you I don't know if he will come tomorrow i think he if he free i dont know when he will come.when he comes,i will call you. if i like i will call you I don't know if he ( ) If he ( ) .I'll let you know if用法求教I don't know if you should call me a pushover for that