Since you are tired,have a rest这句话有没有语病

Since you are tired,have a rest这句话有没有语病
Since you are tired,have a rest这句话有没有语病

Since you are tired,have a rest这句话有没有语病
没有

有。
since是自从的意思，这里不应该这样用。换成if吧。、
you are tured是虚拟语气，应该用you were tired。
后面一句是祈使句，完全正确。

没有 既然你累了，休息一会吧