I would appreciate a little help on these questions!

[Sonichka]

1. "Sometimes, you have to take a leap of faith." What does this sentence mean?
2. "This is the time of year." Why don’t we put any article before "year"?
3. To what kind of grammar structure we can refer these phrases “watch him go” “saw him run” “watch her come” etc.?
4. "We’ve been competing ever since you stole my “electric youth” routine and won miss junior teen Queens”
A teenager is a young person between 13 and 19 years old, right?
Then who is junior teen? A person between the age of 13 and 15?

[Kitosdad]

Hi Sonichka, I'll do my best to help you.

1. You just have to believe what you have been ttold, or have belief in the person who told you.

2. It is optional to do so, but most say it this way.

3a. " This boy is really fast, watch him go. "
3b. " I saw him run last year, he's really fast.
3c. I think this refers to her finishing burst, just before the end of the race. ( Not certain. )

Teens are 13 to 19.
Pre teens are just that, pre teens ... less than 13.
" We've been combatants as long as I can remember. " ( Again, not certain. )
_________________
If you need me, I'm here.

[Milanya]