Придумать 2 предложения из любых фраз и поставить эти предложения во все времена: to make life complete; to concentrate on studies; to cheat at test; to party with fellow students; to acquire knowledge and skills; to provide studentswith necessary knowledge and skills.

1. I try to concentrate on studies. - Pr.S
I tried to concentrate on studies.  - Past Simple
I’ll try to concentrate on studies.  - future
I’m trying to concentrate on studies.  - Pr.cont.
I have tried to concentrate on studies.  - Pr.perfect
I had tried to concentrate on studies.  - Past perfect
I have been trying to concentrate on studies - Pr.pefect cont.

2 They want to acquire knowledge and skills for their future jobs.
They wanted to acquire knowledge and skills for their future jobs.
They will want to acquire knowledge and skills for their future jobs.
They have wanted to acquire knowledge and skills for their future jobs.
They had wanted to acquire knowledge and skills for their future jobs.
Так как «want» в present contin. особо не употребляется, можно сказать так They are going  to acquire knowledge and skills for their future jobs.