i want to know if he ___(come) yesterday.

i want to know if he ___(come) yesterday. I want to know _____ he will come tomorrow为什么是 if 而不是 when I want to know if he still works in the factory. 请问if引导的宾语从句前的to know是个什么成分?I want to know if he will go to the park with us I want to know if you ever loved me? I want to know if it ____(not rain) tomorrow I want to know if you can be with joy, I want to know __ he is tall.A.that B.if C.how D./ 翻译并语法说明 what i want to know is_ he likes the gift given by us.a.thatb.if c.whetherd.不填 what i want to know is ——he likes the gift given by usthat if whether / i want to know if there is anything new还是i want to know if there is something new i want to know if there is anything new还是i want to know if there is something new i want to know if he--- to visit the Expo 2010.if he---,i want to go with him.A、will go;will goB、will go；goseC、gose;goseD、gose;will go I want to know when he -----(finish)the work. he want to know if you need help? 请问if在这里是什么从句? I want to know if he can come here on time和I'd like to know what you want best分别是什么从句?哪个是先行词,哪个是引导词急求啊！！ I want to know if Mary needs any help.这里的want to know 是什么成分呢?I want to know if Mary needs any help.这里的want to know 是什么成分呢? I want to know if you are late.Tell me if you are