10.Although
Although/even though/though + S + V, S + V
Although the exercise is difficult, the boys can solve it
= Much as + S + V, S + V
Much as the exercise is difficult, the boys can solve it
= No matter what + S + V, S + V
No matter how difficult the exercise is, the boys can solve it
= However + adj/adv + S + V
However dificult the exercise is, the boys can solve it