I had a really hard time with science这句话中with science 可以用 to study science吗?可不可用I had a really time studying science.

I had a really hard time with science这句话中with science 可以用 to study science吗?可不可用I had a really time studying science.
I had a really hard time with science这句话中with science 可以用 to study science吗?
可不可用I had a really time studying science.

I had a really hard time with science这句话中with science 可以用 to study science吗?可不可用I had a really time studying science.
请注意比较：
I had a really hard time with science.
==I had a really hard time (in) learning / studying science.

是可以用I had a really time studying science
其实time后面省略了in
所以是可以的
to study science是不可以的
有不明白的地方再问哟，祝你学习进步，更上一层楼！ (*^__^*)

语境不同不能用，没有study science 这个说法吧？！