STUMPERS XXXVIII

Can you think of two words, one of three letters and one of five letters, such that if you add the same two letters to the front of each word, they will form the present and past tense of the same verb?

HINTS:
#1: The first of the two letters to precede each word is T.
#2: The second of the two letters to precede each word is H.

Answer:

The two words are INK and OUGHT, giving THINK and THOUGHT