Certainly! Here's how you can complete the conversation using the correct forms of the words in brackets:
INTERVIEWER: Ben, how long have you been swimming?
BEN: Well, I started swimming when I was eight, so I've been swimming for 14 years.
INTERVIEWER: And when did you start swimming in competitions?
In the conversation:
1. "for" is used to indicate the duration of time something has been happening. In this case, Ben has been swimming for 14 years.
2. "did" is the correct form of the verb "do" used in past simple tense to form the question in the conversation.
By using "for" to express duration and "did" for past simple questions, the conversation flows smoothly and accurately conveys the information being discussed.
