suddenly,l,but,felt,worried,very,say,couldn't,anything(连词成句）

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• suddenly,l,but,felt,worried,very,say,couldn't,anything(连词成句）
• suddenly,l,but,felt,worried,very,say,couldn't,anything(连词成句）
• 连词成句 1 should,we,our,try,best,solve,problems,these,to2 grandpa's,about,jenny,always,is,worried,her,health 3 medicine,the,made,very,him,so,he,bed,went,sleepy,to 4 back,started,as,cindy,soon,write,as,she,got,home,to 5don't,us,go,you,swimming,why,with 6 the,quite,for,good,spelling,except,several,mistakes,article,is 7 him,the,manoid,me,l,asked,could,if,help 8 when,woke,after,her,up,she,fould,she,a,was,nurse,looking
• The room is so dirty that we can't clean it.（改为同义句The room is ( ) dirty ( ) clean.
• He said he couldn't follow me.句中couldn't能换成can't吗?He said he couldn't follow me.他说他跟不上我表示过去的能力时只能用can的过去式could吗?我查了资料又说了许多表示过去能力不用could的情况,感觉好乱.甚至有些语法直接说二者没有时态区别!