I couldn't underst and why they were all laughing at me.为什么laugh要加ing

I couldn't underst and why they were all laughing at me.为什么laugh要加ing I couldn't make a ____ i couldn't agree I couldn't help i couldn‘t是什么意思 I ALMOST COULDN'T 还是I COULDN'T ALMOST? i probably couldn't造句 words i couldn t say I couldn't care less. i couldn't help but I couldn't agree more. i couldn't stop thinking I couldn't miss you 用--ing分词改写句子He cut off the electricty quickly so that an accident was prevented.The old man was fast asleep and held a book in his hand.As he was crossing the road, he was run over by a car.As he didn't know English, he couldn't underst He couldn't play with candles.I couldn't e . Though I couldn't speak,I knew it wasn 't a busy city. I was so frightened that I couldn‘t say a word.=I was_______frightened_______say a word. i told you he couldn't play the violin,A.did i B.didn't i C couldn't he D.could he为什么不选D