Present Simple, Present Perfect, Present Continuous and Present Perfect Continuous

Present Simple

Used to describe an action, habit or facts that are generally true and occur in the present time

Structure : Subject + verb in present form

Examples :

I walk to to work every morning

Anna visits the town centre every weekend

She works as a teaching assistant in the shcool

Used to describe an action that has taken place once or many times before now

Structure : subject + have/has + verb past participle

Examples :

I have walked to school everyday

They have travelled to China twice

Stacey has worked as a teaching assistant for 3 years now

Used to describe an action that is ongoing now

Structure : Subject + am/is/are + verb (+ing)

Examples :

It is snowing today

I am studying for my exam

She is eating her lunch

Used to describe an experience or an action that started in the past and is still continuing till the present moment.

Structure : subject + have/has been + verb (+ing)

Examples :

I have been studying for 3 hours now

They have been living in the same house since 1999

It has been sbowing all morning