What are verbs that past tense have to double the end of letter?

You're asking about verbs that double the final consonant before adding "-ed" in the past tense.

Here's the rule:

Double the final consonant if:

1. The verb has one syllable and ends in a single consonant preceded by a single vowel (e.g., stop, plan, clap)

2. The verb has more than one syllable and the stress is on the last syllable, and it ends in a single consonant preceded by a single vowel (e.g., permit, begin, admit)

Examples:

* Stop -> stopped

* Plan -> planned

* Clap -> clapped

* Permit -> permitted

* Begin -> began

* Admit -> admitted

Important Note:

* This rule applies only to single consonants. If the final letter is a vowel or a double consonant, you don't double it.

* Examples:

* Read -> read (doesn't end in a consonant)

* Call -> called (doesn't end in a single consonant)

Let me know if you have any other questions!