The word could is main word, your welcome
I would love to play tennis with you; <em>however</em>, I really have to get back to practice for my recital now.
I'm not 100% sure. but I believe it's the third option
"She bought the least expensive cage for George, the parakeet."
The sentence is not grammatically correct, it should be, "Last summer, Jim mowed one lawn, now he mows three." Mowed just one lawn doesn't make sense in one sentence.
