English Grammar Rules & Mistakes: Learn All of the Essentials: Writing, Speaking, Literature and Punctuation Rules Complete with 10 Key Skills and Over 200 Common Error Examples

SENTENCE STRUCTURE AND COMPOSITION
A sentence is a statement that makes a complete thought. Sentence structure
is composed of many parts with the subject and predicate being the
foundation of every sentence structure. In this chapter, we will explore errors
that can arise from the wrong usage of various parts of a sentence.
Present Tense
A present tense describes an event that is currently taking place or a state of
being. For example, “I am glad” is a present tense. Present tenses are
considered to be easy to master. However, people still make mistakes despite
their simplicity. Here are some common mistakes that are often made with
the use of present tense:
Don’t forget to add “s” to the end of the third-person singular in the present
sample.
Incorrect: Kid’s health depend on eating enough vegetables.
Correct: 
Kids’ health depends on eating enough vegetables.
Don’t use the present simple instead of present continuous for actions that are
happening at the moment.
Incorrect: He walks so slowly.
Correct: 
He is walking so slowly.
Don’t use will instead of the present simple to express a future action after
words such as whether, if, as soon as, and before.
Incorrect: If the weather will be bad, we will not go to the mall.
Correct: 
If the weather is bad, we will not go to the mall.
Don’t use the present continuous instead of present simple when talking
about well-known facts.
Incorrect: The earth is revolving around the sun.

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Correct: 
The earth revolves around the sun.
Don’t use the present continuous after words that express emotions.
Incorrect: Father is loving you to the moon and back.
Correct: 
Father loves you to the moon and back.
Use the present perfect when talking about something that was not completed
until the moment of speaking.
Incorrect: I am waiting for you since 7 o’clock.
Correct: 
I have been waiting for you since 7 o’clock.