✔ 最佳答案
1. "be going to" implies that somebody does something very soon.
"Will" implies that somebody does something in the future.
2. "Whom"is used when you explain an object in a sentence.
"Who" is used when you explain a subject in a sentence.
But, "whom" is often used now because we use "who"
instead.
3."When" implies someone does something in a moment.
"While" implies someone keeps doing something in a moment.
4. It's because of the principle of vowel.
When you see a verb including a vowel ( a,e,i,o,u ) at the end before
a consonant,you should write that verb in double-vowel form
like your example " swimming".