Question

To allow teenagers to study in groups during the evening is

Answer 1

It is a good way to allow teenagers to study in groups during the evening.

可以,只是意思是有点不一样了

for 对于青少年来说,在晚上学习是个好法子

to allow 允许青少年在晚上学习是个好法子

所以,如果改成同义句的话,不能用for,而要用to allow