I dont know how to use commas.

I do not know how to use commas.这个句子是什么结构?how to use commas是 I don' know how to use commas是不是宾语从句 主语又是什么 i dont know how to use chopsticks very well …and i dont know 求“I don't know how to use commas”的同义句“I am good at swimming” i don t know how ---(use) commas.i don t know how ---(make) 英语 改同义句：i don not know how i can use commas 7.I don’t know.How do I use commas?（变成一个复合句） I don’t know I 英语连词成句 5句1 use,commas,how,to,know,wants,to,Lucy 2 know,want, I don't know how commas 该是什么 i do not know how i use the computer同义句i dont know —— ——use 求歌!today today today i dont know what to say i dont know how My lovers dont know what is "pub".I dont know how to explain