一also 后是中位状语,放在行为动词前 (also do)、跟在系动词后 (be also或夹在助动词/情态动词与动词之间 (如 can also do)。
The  sofa  can also be used as a bed.。这沙发也可以当床。I play squash and I also play tennis.。我打壁球,也打网球
二
1、only位于句首修饰状语要倒装。
例如:
only in this way can you learn english well.
2、在句首的only如果后面跟了副词、介词短语或从句等状语,则主句用倒装结构。如only后跟的是主语,就不用倒装结构了。
例如:
Only when the war was over in 1918 was he able to get back to work.