Grammar:Tutorial/Perfect tense of regular verbs
Perfect of regular verbs is formed by adding a suffix to a three-letter root. For regular verbs the suffixes are the following:
The 3rd person singular masculine (just the three-letter root) form (not infinitive) is usually taken as the primary form in Hebrew dictionaries.
If the last letter of the root is the same as the first letter of the suffix, then that letter is omitted (written only once).
2nd person singular masculine sometimes has the suffix תה (instead of ת).