-an (pokus sa direksyon)

The -an suffix is a versatile tool in Filipino grammar. Crucially, when using an -an verb, the recipient or location becomes the focus of the sentence and must be marked by ang (or si, or an ang-pronoun), as in Sulatan mo ang papel (Write on the paper). Equally important, the actor (the doer of the action) must be marked by ng, ni, or a nonfocused pronoun (like ko, mo, or niya). It primarily serves these functions:

• Recipient/Direction: It highlights the person or thing to which an action is directed (e.g., bigyan - to give to someone).
• Location: It highlights the physical space where an action occurs (e.g., sulatan - to write on something).
• Reciprocal Action: When paired with the prefix mag- to form the circumfix mag-...-an, it indicates that an action is mutual or shared between participants (e.g., magkuwentuhan - to talk to each other). Note that nag- is its conjugated started or realis form (e.g., nagkukuwentuhan - talking to each other).
• Noun Formation: It transforms roots into nouns representing a place where the root object is found or where the action happens (e.g., aklat 'book' becomes aklatan 'library'). Note that for nouns, the stress often shifts to the very last syllable to distinguish it from the verb form. For example, from the root káin, the noun form is kainán (eatery, with ultimate stress), which contrasts with the verb form kaínan (to eat from/at, with penultimate stress).
• Surface/Partial Effect: It is used when only the surface of an object is affected (like washing a plate), rather than the object being consumed.

Morphological Changes:
1. -an: Used for roots ending in a consonant (e.g., sulat + -an = sulatan) or a spoken glottal stop (e.g., lutò + -an = lutuan).
2. -han: Used for roots ending in a smooth vowel without a glottal stop (e.g., basa + -han = basahan).
3. Irregular Forms: Some roots undergo vowel dropping or changes, such as kuha becoming kunan or bigay becoming bigyan.
4. 'O' to 'U' Change: Roots ending in 'o' change to 'u' before adding the suffix (e.g., luto + -an = lutuan).

Interaction with Aspect:
To become proficient in using -an verbs, you must note how they change across aspects. The neutral form uses just the suffix and is primarily used for giving commands or imperatives (e.g., Sulatan mo ito). The completed aspect adds the -in- infix (e.g., sinulatan). Note that this infix becomes the prefix in- for vowel-starting roots (e.g., inupuan) and ni- for roots starting with L, R, W, or Y (e.g., nilagyan). The progressive aspect requires reduplication of the first syllable plus the -in- infix (or in-/ni- prefix) and -an suffix (e.g., sinusulatan). The contemplated aspect uses reduplication and the -an suffix without the infix (e.g., susulatan).

Stress Shift: Adding -an shifts the word's stress one syllable to the right. For example, búhay (life) becomes buháyan (to give life to), and bilís (speed) becomes bilisán (to speed up).