I can't see the words on the blackboard.Why,your eyes need to be examined.为什么不能直接说need to examined,而要加be?这里be的用法谁能帮我解释一下?

you can’t see the word for the trees. 翻译 I can`t see any w{ } on the blackboard?w 开头的单词 到底是Word 还是Words I can't see i'm sorry i can't spell the -----(nine)word i can eat nothing （t ） i see the doctor I can't see the ball.It's ( ) the door. I can't see-------.Where are the animals?-----填单词 where's the teapot?i can't see it While I'm crying,you can't see the I can't wait ____ (see) the film. i can't see the things there.是什么意思? I can't see any _____animal in the small zoo I can't see clearly .Please （ ） the newspaper ( )me. I can't see here. love is like the wind,i can`t see it ,but i can feel it I can' see the books. where is the pencil?用I don't know 为啥不用I can't see it 1;I’m sorry,i can’t spell the ____(three)word.