You would use the word it's in place of the words "it is" because it is a contraction.
If you were to say "It is hot outside today!", you would instead say "It's hot outside today!"
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Answer:
1.научиться
2. научиться
3. учиться
4. учил
5. научил
Explanation: I know russian pretty good
The moral is that getting something little at a time instead of nothing is bettter
I don’t know maybe u should at least and try to study or ask a friend
It could cause drowsiness or impair your reaction time