Modal verbs
Will and
  would for habitual behaviour
Will
 Will can be used to talk about people's habitual
  actions or their characteristic behaviour.
  -  He will spend hours at a time on the Internet.
    (= He habitually spends hours at a time on the Internet.) 
  - They will spend hours on the beach every summer.
    
 
  - Tom won't get home before sunrise at the weekends.
    
 
Will can be used in the contracted form.
  -  He'll talk to himself for hours. 
 
Will can be stressed (emphasised) in a
  sentence. This expresses criticism of a habitual action or characteristic.
  -  She will arrive late for dinner parties.
  
 
  - He will wear those awful sweaters. 
 
Would
 Would is used to talk about people's habitual
  actions or their characteristic behaviour in the past.
  -  My mother would go really quiet when she was
    angry. 
 
  -  We'd stay up late talking about politics,
    but we wouldn't actually do anything. 
 
 Other ways of talking about habitual behaviour
 Be in the habit of + -ing
  and the adverbs habitually, always,
  usually and regularly
  can also be used to talk about habitual actions and characteristics.
  -  On my day off I am in the habit of spending
    all morning in bed. 
 
  - She habitually watches six hours of TV a day.
  
 
  - On a good day I usually get to work at nine.
 
  - Some dogs regularly bark for no reason.
 
  
Be + forever + -ing describes  habitual actions, especially of an annoying nature. 
  - He was forever stuffing popcorn in his mouth.
 
  - They're forever coming home late and making lots of noise.
 
Keep + -ing also  describes repeated actions that are annoying. 
  - You keep making so much noise!
 
  - She keeps turning up late to  all the meetings.
 
Used to + infinitive describes habitual past actions or states. 
  - I used to get up early, but I don't anymore.
 
  - We used to live in a tiny flat near the airport.