will / shall

We use 'will' (contracted to 'll) to talk about the future in three main ways. First, for predictions — things we think or believe will happen: 'It will rain tomorrow.' 'I think she'll pass the exam.' Second, for instant decisions — choices we make at the moment of speaking: 'The phone is ringing. I'll answer it!' Third, for promises and offers: 'I'll help you with your homework.' The negative is 'will not', contracted to 'won't': 'He won't be late.' For yes/no questions we put 'will' before the subject: 'Will you come to the party?' — 'Yes, I will.' / 'No, I won't.' We also use 'Shall' with I and we to make polite offers or suggestions: 'Shall I open the window?' / 'Shall we go now?' Note that 'will' goes with ALL subjects (I/you/he/she/it/we/they) and is always followed by the base form of the verb (no -s, no -ing). For example: 'Shall I carry your bag? — Yes, please. I think it will be very heavy!'