I know that this one should be:

John could get a better view of Mars if his telescope were stronger.

(the word “were” is the change I made)

Vicky below is wrong….When you say “If something,” the proper tense of the next verb is “were” not “was”

*Kelly is the extra perfect of the twins. (in user-friendly terms 2 so use extra no longer maximum) *a stable plumber continually brings an entire set of books. (won’t be a male plumber?) *The annex, added to the abode in 1905, residences our information. *The coverage handbook grow to be written by your supervisor. *Did he incredibly say he might resign? (i think of ‘that’ might nicely be left out) *you could plan on being back by 3:00 P.M.; the bus ought to return to its depot by 4:15 P.M. (can use a semicolon or 2 seperate sentences. as much as you.) *i’ve got self assurance undesirable as we communicate. *the abode that has the two motor vehicle storage is the only we offered.

They are correct. I don’t agree with changing the word was to were.