I couldn't see anything unusual in this room.请问这里的see为什么不用过去时?

I couldn't believe what I -------(see). i couldn't see you 是什么意思? I____(turn) around but I couldn't see anything. i couldn't agree I couldn't help i couldn‘t是什么意思 it was so dark that i couldn`t see ait was so dark that i couldn`t see anything ____（clear）.这里不是不定代词加adj.. All I can see in the silence that remains are the words I couldn't say “You couldn’t see my tears cause I am in the water.“ Fish said to water. I couldn't see the film with you ,because I___ ___the film twice I couldn`t see much during the flight because there was too much cloud. I couldn't really see or hear the guide（肯定句） i couldn't see that it was right therethat it was 这部分怎么读 Where do you go?I couldn't see you on line She couldn't see or hear a____ We couldn't see through the It was so dark that I couldn't see anything.改为同义句 It was ( )dark for me ( )see anything. I couldn't see anything unusual in this room.请问这里的see为什么不用过去时?