Simple, continuous, perfect and perfect continuous.

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-30/session-1

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-24/session-1

http://www.bbc.co.uk/learningenglish/english/course/upper-intermediate/unit-12/session-1

We use the future continuous, will + be + present participle,

• to talk about events that will be in progress at a particular time or over a period of time in the future,
• to talk about events that will happen in the normal course of things, and
• to politely enquire about a person's plans for the future.

We use be + to-infinitive to talk about future events which involve instruction or necessity.

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-22/session-2/activity-3

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-10/session-1

Narrative tenses are used to describe events that happened in the past, and for telling stories.

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-20/session-2/activity-3

http://www.bbc.co.uk/learningenglish/english/course/upper-intermediate/unit-26/session-1

The past simple is used to describe an action that happened and finished in the past.

The past continuous, was/were + present participle, is used to describe an action that was in progress at a particular time in the past but not completed.

http://www.bbc.co.uk/learningenglish/english/course/lower-intermediate/unit-7/session-2/activity-4

We can use the present continuous, be + present participle, to talk about the future when we have already arranged to do something.

We can use be + going + to-infinitive to talk about something that we have decided to do in the future, but not arranged yet.

http://www.bbc.co.uk/learningenglish/english/course/lower-intermediate/unit-9/session-2/activity-3

The present simple is used to describe things that we do regularly, facts, habits, truths and permanent situations.

The present continuous, be + present participle, is used to describe things that are happening at the time we are speaking, temporary situations and activities that are in progress. Stative verbs are not usually used in the present continuous.

http://www.bbc.co.uk/learningenglish/english/course/lower-intermediate/unit-2/session-2/activity-3

We use the present simple tense for things that we do regularly and for facts, habits, truths and permanent situations.

We use the present continuous for things that are happening at the time we are speaking, for temporary situations, and for activities that are in progress.

We use the present perfect for life experiences in the past, recent past actions that are important now, and past situations that are still happening now, often with how long, for and since; with just, already, yet for recent events.

http://www.bbc.co.uk/learningenglish/english/course/intermediate/unit-1/session-2/activity-3

Some state verbs can be used in the continuous form

• with the adverbs forever, always and constantly to show annoyance about a repeated habit,
• to make requests and questions more polite and less direct,
• to emphasise a strong feeling at the moment of speaking, and
• in some idioms and set phrases.

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-5/session-1

We use the present simple for things that we do regularly and for permanent situations.

We use the present continuous for things that are happening now and for temporary situations.

We use the past simple tense when an action or situation happens and finishes in the past.

We use the present perfect to talk about our experiences in the past often with ever or never; to talk about situations that started in the past and are continuing now often with how long, for or since; to say whether an action has happened or not at the present time with just, already or yet.

We use the present continuous to talk about the future when we have made an arrangement to do something.

We use be going to + infinitive for future plans.

http://www.bbc.co.uk/learningenglish/english/course/lower-intermediate/unit-20/session-2/activity-3