start + to + base form
It started to rain.
start + -ing form
It started raining.
start + with + noun
Let’s start with some warm-up exercises.
start + by + -ing form
Let’s start by doing some warm-up exercises.
start + noun
We started the meeting at 10 a.m.
start + noun + with + noun
We started the meeting with a review of the previous meeting.
start + noun + by + -ing form
We started the meeting by reviewing the previous meeting.