Tenses in English

Tense in the sentence provides valuable information about when the action happened.

There are 3 simple tenses.

1. Present - Action happens in the present (e.g. I work)
2. Past - Action has happened in the past  (e.g. I worked)
3. Future - Action will happen in the future (e.g. I will work)

Making sentences in simple tenses is very easy. All you need to know is verb. 

Additionally, you need to remember one important rule.

Positive sentences

If the subject is "He/She/It" (Singular third person) and you are making a sentence in present tense, you need to suffix "s" at the end of verb. Sometimes, we need to suffix "es" if the verb ends with "O". Remember that this rule applies to present tense only.

For example -

Below sentence is incorrect.

He work

Instead of that, we use below syntax.

He works

When the subject is a noun, you need to first convert it into pronoun. Once you know pronoun, you can easily apply above rule. For example - In first sentence below, subject is a single train which means it. So the rule will apply. But in second sentence, we are talking about more trains (plural), so rule does not apply.

Train (It) arrives.

Trains (They) arrive.

I have a pen.

There is a box.

Negative sentences

When the sentence is negative and in present or past, you need to use special verb - do (do - does - did - done)

For example -

I do not work

He does not work

He did not work

I will not work

I do not have a pen

There is not a box

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