The students heard the fire alarm. HAVING - The students (...) lunch when they heard the fire alarm.
The students were having lunch when they heard the fire alarm.
I don't eat a lot of snacks between meals. AVOID - I (...) a lot of snacks between meals.
I avoid eating a lot of snacks between meals.
We've been here since 9.15 and now it's 9.45. THIRTY We've been here (...) minutes.
We've been here for thirty minutes.
Bob sent you a link a few seconds ago. JUST - Bob (...) you a link.
Bob has just sent you a link.
Nobody knew what to do when we saw a bear. KNOW - We (..) what to do when we saw a bear.
We didn't know what to do when we saw a bear.
This is the first time l've ever eaten sweet potato. NEVER - I...sweet potato before.
I've never eaten sweet potato before.