To watch another carrying a load requires no exertion.
I think it should be "after all of her exertion", but otherwise, yes.
After a long day of hiking, Maria felt exhausted from the exertion of climbing steep hills.
no
You can use the sentence: She spoke to him reprovingly
we should use had if the sentence is in past tence
Strenuous describes hard and extended physical exertion or exercise.
You should use the word "I" when it is the subject of a sentence, and the word "me" when it is the object of a sentence or of a preposition. "I want you to understand me." "I want you to listen to me."
a sentence could be... "While running a marathon, you may physically exert yourself, so drink plenty of water."
As soon as he does that you should do this.
If it is in the past.
you should have a answer
use "that" when the meaning of the sentence changes. Sometimes "that" can be left out of the sentence. Never use a comma with "that". Use "which" when the meaning of the sentence does not change. Always use a comma with "which".