Present simple

The simple present tense is used:

• To express habits, general truths, repeated actions or unchanging situations, emotions and wishes:

I smoke (habit); I work in London (unchanging situation); London is a large city (general truth)

• To give instructions or directions:

You walk for two hundred meters, then you turn left.

• To express fixed arrangements, present or future:

Your exam starts at 09.00

• To express future time, after some conjunctions: after, when, before, as soon as, until:
  He'll give it to you when you come next Saturday.

He'll give it to you when you come next Saturday.

Forming the present simple with verb "to think":

Notes on the third person singular:

• In the third person singular the verb always ends in -s:

                      he wants, she needs, he gives, she thinks.

• Verbs ending in -y : the third person changes the -y to -ies:

                           fly --> flies, cry --> cries
             Exception: if there is a vowel before the -y:

                         play --> plays, pray --> prays

• Add -es to verbs ending in:-ss, -x, -sh, -ch:

                 he passes, she catches, he fixes, it pushes

if you want to learn more watch this video 👇🏼

https://www.youtube.com/watch?v=L9AWrJnhsRI

Practice time:

https://www.englishgrammar.org/simple-present-tense-exercise-3/

https://www.ego4u.com/en/cram-up/tests/simple-present-1