The Alternative Story wrote:Hi KRR,
Answer (1) is definitely wrong, in fact, that is a mistake commonly
made by students.
The answer can be both (2) or (3). For (3), the 'going to bed'
becomes a noun (a gerund), hence it is accepted so you
either have a gerund ('ing' form) or you need to use
the past perfect tense to differentiate the timing. (one action
happened before another)
Examples of gerunds:
- I enjoy dancing (Dancing is the name of the activity, it is a
- I looked forward to meeting you. (Meeting is the name of
the activity, it is a gerund)
Thank you very much TAS for your effort, your explanations have been so clear.