seat belt

I set off.

私は出発します

I set off with my family.

私は家族と出発します

I set off with my family before we go on the trip.

私は家族と旅行に行く前に出発します

I set off with my family after fastening the seat belts, before we go on the trip.

私は家族と旅行に行く前に安全帯を出発します

I set off with my family after fastening the seat belts firmly, before we go on the trip.

私は家族と旅行に行く前に安全帯をしっかり締めて出発します