How do you use vigor?

I am amazed that the elderly people have so much vigor. This is the first study that has looked at hybrid vigor in any crop on such a large scale.

"he plays tennis with great vigor"; "he's full of vigor"

A drawbridge allows welcome guests into a castle to cross the moat(a trench of water that goes around the perimiter of the castle)

You use "in" when you mean "in" and you use "or" when you need to use "or". It is rather difficult to construct rules for the use of prepositions in most languages.The grammatical structure of the...

Using " Has " is referred a past tense. Such as: He has taken the garbage out already. Using " Is " for example is referred a Present tense. Such as: He is taking out the garbage.