介詞+動名詞

Question

I feel tired, after doing so much exercise. 這句話有逗點因此 after doing so much exercise 是分詞構句。
如果將逗號拿掉可以嗎? 如果可以，那 after doing so much exercise的文法作用是什麼?

Answer 1

I feel tired, after doing so much exercise. I feel tired after doing so much exercise.文法上都是對的不論加不加逗點都是分詞構句通常不加逗點的寫法較多喔

Answer 2

I feel tired after doing so much exercise. or
I feel tired ,after doing so much exercise.
表示時間的副詞片語.

I feel tired doing so much exercise.
分詞片語. 先後關係不是重點. 附帶說明而已.

Having done so much exercise, I feel tired.
分詞構句.

Answer 3

after是個介係詞
介係詞後面的動詞一定要變成動名詞

這句
把逗號拿掉是可以的
I feel tired after doing so much exercise.
基本上拿掉之後他還是個分詞構句阿
因為after後面本身就已經省略掉（I do）so much excercise
因此不管逗號加不加
用法是維持一樣的