Question

She knew they were having the same troubles that she had experience.中have为什么用having

Answer 1

She knew they were having the same troubles that she had experienced.中have为什么用having
they were having the same troubles 是一个宾语从句。宾语从句的谓语动词用【过悄缺饥去进行时】，意思是【她那时知道】他们那时【正遇上了】她扮桥曾经历过的麻烦。
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Answer 2

强调她知道的时候他们正在经历同样的麻烦，所以用过去进行时。

Answer 3

were 属于渣瞎乎 be 动词 are 的过去式，所以用 be doing 表示他们过去的那个如悉时间神宴刚好正在做某事

Answer 4

know sb doing sth 知道某人正在做某事。
她知道禅拿他们正在遭迟袭正遇她所经历码悔过的同样的麻烦

Answer 5

be后面有动词就要用动词ing形式呀。。。