after having spent whole mornings on the river可以改成 After I have spent..吗原话为 After having spent whole mornings on the river,I always go home with an empty bag.可以改成After I have spent whole mornings on the river,I always go home with an empty bag.吗 如果主句是I went home 那After后还能用 动名词 after having spent吗 或者直接用after I had spent?

可以改成After I spend whole mornings on the river,I always go home with an empty bag.
如果主句是I went home After后还能用 动名词 after having spent
或者直接用从句after I had spent或after I had spent

After having spent whole mornings on the river,I always go home with an empty bag.
可以改成After I have spent whole mornings on the river,I always go home with an empty bag.
如果主句是I went home 那After后还能用 动名词 after having spent,当然了还可以直接用after I had spent了.
说明如下：
after引导的状语从句中的主语与主句的主语相同时,可以省去从句中的主语.之后的动词变成现在分词,如果有助动词have,has,had的,要视为动词变成having,后面的动词仍是过去分词.