Irregular Past Tense Verbs
Regular past tense verbs in English are pretty easy: simply add -ed to the verb and you are done! But those irregular verbs can be a problem.
Here is a helpful list of irregular verbs in English along with their irregular past simple and past participle forms: Irregular Verb List
Print it out and keep a copy at your desk for when you are writing emails, reports, or presentations. It could really help!