Ricardo F. Bernardi escreveu:[...]Don't drike and drive. If you friend needs a help, call a cab.[...]
You probably meant "Don't drink
You may wish to correct "If you friend needs a help [...]" to "If your
friend needs help
[...]". Not often will we use an indefinite article before abstract nouns. You can, however, use the indefinite article with any abstract noun, as long as you can speak of a certain kind of that abstract noun. In other words, if you qualify (adjectivate) the help you want to give, then you can certainly use an indefinite article with it.
"You have to give your wandering brain a
by consciously selecting something positive to think about." -- Here little
. So it takes an "a".
"Come here, you guys. I guess our new neighbor Farmácio Lopes needs a
with his cantankerous lawn mower." -- Same as above.
"The guys that helped Farmácio with his cantankerous lawn mower regarded the simple act of talking to someone face to face as an
to someone suffering from depression." -- Same as above.
"To ward off his (heavily armed) assailants, Honório had only a fishing rod, which seemed of little help
as a weapon, puny, dull, and weakly flexible." -- Although little
here, it does not take an "a".
"I can see you guys sinking in the quicksand. I'll go get help
and come back. Hang in there!" -- Same as above.