Lest / in case (for fear that) / (by chance)

Lest / in case (for fear that) / (by chance)

Lest —— should

In case ——- should

a) Sub1 + verb ——- + lest / in case + sub2 + should / might / would + verb’s base form + Ex

b) Sub1 + verb ——- + lest / in case + sub2 + verb-এর base form + Ex