1. go grey (become)
go home, go for a drink, go a walk, go a meal (move to a place)
go off something (other)
2. take a taxi (go in a vehicle)
take part in something (join in)
take responsibility for (phrasal verbs)
take after someone (other)
3. get married (become)
get a job (obtain)
get here (go somewhere)
get on with someone (phrasal verbs)
4. do exercise (activity)
do housework (responsibilities and tasks)
do research (find information)
do someone a favour (help someone)