Masculine Singular Past

To form the masculine singular past tense for most verbs ending in a vowel + -ć, remove the -ć to find the stem and add these endings:

• 1st Person (ja): Stem + -łem
• 2nd Person (ty): Stem + -łeś
• 3rd Person (on/noun): Stem + -ł

Note: While this focuses on the singular, plural forms use -liśmy/-łyśmy (1st person) and -liście/-łyście (2nd person). The person markers -śmy/-ście attach to a plural past form, not directly to an arbitrary infinitive stem.

Important Stem Changes & Irregularities:
1. -e- to -a- shift: Many verbs ending in -eć (like mieć or widzieć) change the e to a in the masculine singular (miał, widział). This a is actually used in almost all past forms (like miała, miało), while the original e only remains in the Masculine-Personal Plural Past (mieli).
2. Ó And O Stem Alternation: Stems ending in consonants often use ó in the 3rd person masculine singular (e.g., mógł, niósł). However, this reverts to o in the 1st and 2nd person masculine singular (mogłem, mogłeś), as well as in feminine and non-virile plural forms (niosły). For verbs like nieść or wieźć, the vowel changes to e in the masculine-personal plural (nieśli, wieźli).
3. Verbs in -ść and -c: Verbs like nieść or móc reveal their underlying stem consonant (like s or g) in the past tense. The third-person form mógł already contains the past marker ł. To construct the other masculine singular forms, use the stem mog- plus -łem/-łeś; alternatively, recognize that mogłem has the same one ł plus person ending -em. Attach the full endings directly to the consonant stem (e.g., mog- + -łem = mogłem; szed- + -łem = szedłem).
4. -ą- to -ę- shift: Verbs with a retained nasal past stem from -ąć (like zacząć, minąć, or The Verb Wziąć) use -ą- in the masculine singular (wziął), but -ę- in feminine and neuter singular and plural forms (wzięła, wzięło, wzięli).
5. Irregular and -nąć verbs: The highly common The Verb Iść has a completely irregular masculine past form: szedł. Verbs ending in -nąć that describe a change of state often drop the -ną- suffix in the past tense (e.g., zmarznąć becomes zmarzł). Many verbs describing a single, sudden action keep the nasal vowel (e.g., krzyknąć becomes krzyknął).
6. Mobile Past Endings: The 1st and 2nd person endings are technically mobile clitics (-m, -ś), which become -em and -eś after consonants (like the -ł- of the past tense verb). They can detach from the verb and attach to the first stressed word in the clause, often a question word, conjunction, or pronoun (e.g., Co robiłeś? vs. Coś robił?).

Pronunciation Note: The final -ł is pronounced as [w] when it follows a vowel (e.g., czytał). However, when it follows a consonant (e.g., mógł, szedł, niósł), the -ł is often dropped in casual, everyday speech, but is still lightly articulated in careful or formal standard pronunciation. It must always be written.