It takes her two hours to do her homework every day.

---> She spends 2 hours doing her homework every day

It takes him two hours to do his homework every day.

---> He spends 2 hours doing his homework every day

It’s two years since I last spoke to her.

--->I haven’t spoken to her for two years

It’s two years since he last spoke to her.

--->He hasn’t spoken to her for two years

Going swimming in the river in the summer is interesting.

--->It is interesting to go swimming in the river in the summer.

It took us fifteen minutes to do our test.

--->We spent fifteen minutes doing our test

It took him fifteen minutes to do his test.

--->He spent fifteen minutes doing his test

Keeping the environment clean is very important.

--->It’s very important to keep the environment clean