Present Tense
Example 1.
Cristine often (teach, teaches) her child to read.
time expression: often
subject: Cristine - singular
(Answer: teaches)
Example 2.
At this moment, the thieves (slash, slashes) the victim's bag.
time expression: at this moment
subject: thieves - plural
(Answer: slash)
Example 3.
People (commit, commits) mistakes.
time expression: none (considered as present)
subject: people - plural
(Answer: commit)
HINTS: look for the expression of time then identify the subject (singular or plural)
For singular subjects, use base form of the verb + s or es
For plural subjects, use base form of the verb
If there's no time expression in the sentence, it is considered as present tense
Time Expressions can help determine the tense of the verb in a sentence.
here are some examples:
past - yesterday, lask week, a while ago
present - now, at this moment, often, always, everyday, every weekend etc.
future - tomorrow, in a while, later next month, next year etc.
i hope this helps.

i can also say....
i hope these hints help
have a fab day everyone!!