have a hard time doing sth中doing前省略了in还是with?

have a hard time have a hard time造句 have a very hard time have a hard time doing 还是have hard time doing have a hard time have a difficult time 区别 have a hard time doing sth hard time .In winter,animals have a hard time finding anything to eat. have a hard time with的with在这儿是什么意思? have a hard time doing sth的同义句是什么 have a hard time doing sth. 是什么意思啊? I have a hard time going back to them. have a hard time doing和have hard time to do有区别吗?有没有这个短语have a hard time to do?若有,跟have a hard time doing的区别是什么? have hard times对不对? have a hard time 在这time是不可数的 为什么可以加a? have a hard time接in doing还是接with doing是不是have a hard time 接with sth？ 句型转换 I have a hard time learning mathI have a hard time learning math.I ____ ____ learning math. 为什么have time to do而have a hard time doing have a hard time doing sth和have much time to do 有什么区别? i have a hard time learning english同义句i have（）time （）english