she couldn't get to sleep.get to sleep可不可以用sleep来代替?若不可,why

she couldn't get to sleep.get to sleep可不可以用sleep来代替?若不可,why “Sorry I couldn't get back to try as she might ,Mary couldn't get the box 18.We went to the doctor _____ she couldn't seem to get rid of her cold.B.forD.because go to schoolThe old wuman couldn't get out of the car (because she got hurt)对打括号的部 get understand make understand哪个对?she couldn't ()her words()by the studentsa get understood b make understand c get understanding d make understandd make to understand I couldn't get the candles to l____ she couldn't ____her words ____by the studentA get,understanding B get,understoodC make,to understand D make ,understand选什么, She couldn't ____ her words ____by the students.A get ,uderstandingB get ,undertsoodC make ,to uderstandD make ,understand 答案是B ,为什么?理由~ Life couldn't get better I couldn't get to school on time和I didn't get to school on time有什么区别?couldn't 和 didn‘t 能不能互用? She already had more clothes than she knew ...She already had more clothes than she knew what to do with them,so he couldn't get any kind of apparel.please translate.thank you. she couldn't find her couldn't connect to couldn't wait to 疑问句中情态动词的位置?Why couldn't you get to sleep?能用Why you couldn't get to sleep? 初一英语练习题对括号里的内容提问：She couldn't get out （because she hurt her leg）. She turned her hand in some w_____,still she couldn't get her hand out 应该填什么?