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

Indirect questions help us to be more formal or polite.

• Could you tell me if/whether + statement word order? (for yes/no questions)
• Could you tell me wh- + statement word order? (for wh- questions)
• Do you know...
• Have you any idea...
• Would you mind telling me...

Five ways to use the past for the present or future.

http://www.bbc.co.uk/learningenglish/english/course/towards-advanced/unit-8/session-1

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

Would is used

• in the second and thid conditional,
• for the future in the past,
• in reported speech,
• for repetition in the past, and
• for polite requests.

http://www.bbc.co.uk/learningenglish/english/course/upper-intermediate/unit-4/session-1

• Can I ask a favour?
• Can you do me a favour?
• Could you do me a favour?
• Could I ask you to do me a favour?
• I was wondering if I could ask you a favour. (indirect question in the past continuous tense)

http://www.bbc.co.uk/worldservice/learningenglish/radio/specials/142_requests_offers/page9.shtml

• Can I + infinitive...?
• Could I + infinitive...?
• Would I be able to + infinitive...?
• Is it OK/alright if I + present simple...?
• Would it be OK/alright if I + present simple(less formal)/past subjunctive...?

• Would you mind + gerund...?
• Are you OK to + infinitive...?
• Is there any chance you could + infinitive...?
• I would appreciate it if you could...
• It would be great if you could...
• If you could..., that would be great.