at an earlier time

पहले

English Usage: I will see you sooner than you think.

Hindi Usage: मैं तुमसे पहले मिलूंगा जितना तुम सोचते हो।

a shorter time until a specified event

थोड़े समय बाद

English Usage: They arrived a day sooner than planned.

Hindi Usage: वे तय समय से एक दिन पहले पहुंचे।

as soon as

जैसे ही

English Usage: I’ll call you sooner or later.

Hindi Usage: मैं तुम्हें जल्दी या देर से फोन करूंगा।