Certain high-frequency verbs do not follow the standard -ado or -ido patterns and must be memorized.
Common irregulars include dicho (from decir - to say), escrito (from escribir - to write), hecho (from hacer - to do/make), and visto (from ver - to see).
These irregular forms are essential for natural conversation when discussing plans, such as confirming if a message has been written or a task has been done.
A critical distinction in Spanish is the difference between the two verbs that translate to 'have' in English.
Haber is used exclusively as an auxiliary verb to form compound tenses like the Present Perfect.
Tener is used to express possession, age, or obligation (e.g., 'I have a book' or 'I have to go').
| Feature | Haber | Tener |
|---|---|---|
| Function | Auxiliary (Helping) Verb | Main Verb (Possession) |
| Usage | Followed by a participle | Followed by a noun or 'que' |
| Example | He comido (I have eaten) | Tengo comida (I have food) |
Identify the Subject: Always check who is performing the action to select the correct form of haber (e.g., 'we' requires hemos).
Check the Participle: Ensure you use the correct ending (-ado vs -ido) and watch out for irregulars like visto or hecho.
Word Order: In Spanish, the auxiliary verb haber and the past participle are never separated; words like 'already' (ya) or 'not' (no) must come before the entire verb phrase.
Common Trap: Do not confuse the past participle with the gerund (the '-ing' form). The Present Perfect always uses the participle.
