Question #23019

2 Answers
Jan 23, 2018

#"have failed"#

Explanation:

#"Men have failed to abolish wars "...#

Jan 23, 2018

Men HAVE FAILED to abolish wars up to now, but maybe they will find a way in the future .

Explanation:

1) The subject "men" is plural.
So the verb has to be in the plural too.
"HAVE failed," not "HAS failed"

2) The verb tense must be "present perfect" tense
because the act of "failing" is still continuing in the present.
"HAVE failed," not "HAD failed" or "have been failing"

#color(white)(...................). . . . . . . . . . . #

It's possible to write this sentence without deleting females from the human family or implying that only males are in charge.

> People have failed to abolish wars up to now, but maybe they will find a way in the future.

> We have failed to abolish wars up to now, but maybe we will find a way in the future.

This phrasing is more inclusive because it recognizes that our human species includes both men and women.

#color(white)(...................). . . . . . . . . . . #

You can find out more about the present perfect tense here:
http://grammar.ccc.commnet.edu/grammar/tenses/present_perfect.htm#perfect

#color(white)(...................). . . . . . . . . . . #

I saw in your comment that you must use the verb "manage."

In that case, the best way to phrase this sentence is one of these:

~ Men HAVE NOT MANAGED to abolish wars up to now,
but maybe they will find a way in the future.

~ People HAVE NOT MANAGED to abolish wars up to now,
but maybe they will find a way in the future.

~ We HAVE NOT MANAGED to abolish wars up to now,
but maybe we will find a way in the future.