Hi everyone,

I always have difficulty choosing the correct option from the following type of sentences

Option A: The defenders could have done more to prevent the goal that cost them the match.
Option B: The defenders could have done more to have prevented the goal that cost them the match.

I also have difficulties choosing the correct option from among sentences of the types shown below; for example, which is the best option for a boss to use in a welcome e-mail to a new employee if they know that they won't be there when the person starts?

Option A: I would like to have welcomed you in person.
Option B: I would have liked to welcome you in person.
Option C: I would have liked to have welcomed you in person.

I would be extremely grateful for any help with/explanations on these.

regards

John