Overview of Verb Tenses

Simple Present: It expresses events or situations that exist always, usually, habitually.
Ex. Tom watches TV every day.

Simple Past: Event happened in one particular time in the past. It began and ended in the past.
Ex.Tom played tennis last night.

Simple Future: At one particular time in the future, this will happen.
EX.Sam and Ana are going to study tonight.

Present Perfect: An action happened sometime before now.
EX.Robin has already washed the plates.

Past Perfect: An action that happened before another action in the past.
EX.Tom had already swum when his friend arrived.

Future Perfect: An action will be completely finished before another action in the future.
EX.Tom will already have read when his friend arrives.

Present Progressive: An action is in progress during the present time, and probably will continue.
EX. Mike is running right now.

Past Progressive: An action that begun before another action and was in progress at a particular time in the past.
EX.John was cooking when I arrived.

Future Progressive: An action will begin before another action, and it will be in progress at a particular time in the future.
EX.Mary will be eating when we arrive.

Present Perfect Progressive: An action in progress before now and up to now.
EX.Kim has been calling for two minutes.

Past Perfect Progressive: An action in progress before another event in the past.
EX.Erica had been jogging for two hours before her friend came.

Future Perfect Progressive: Action in progress before another event in the future.
EX.Tom will have been eating for ten minutes by the time his friend arrives