from time to time

https://tts.langeek.co/read?text=ZnJvbSB0aW1lIHRvIHRpbWU&hash=1ecaa38883850be18d4deefb6adc7e92be29d4af&lang=en&cache-only=0&driver=googletts

Learn FCE vocabulary for time and sequence, including order, duration, frequency, stages, deadlines, timing, and relationships between events.