The ます (masu) Form Part 2

We learned how to conjugate a verb from its dictionary form to its ます form, and now we'll learn a little more about how to make it past tense and negative.

Remember, conjugating a verb from its dictionary form to its ます form is simple. Just drop る for る-verbs, or replace the -u ending with -i for う-verbs, and then add ます. However, this only conjugates it into the affirmative, present tense.

To conjugate verbs from their dictionary form to negative, present tense ます form:
It's the same as conjugating to ます form, but instead of ます you use ません (masen).
たべる (taberu = to eat) becomes たべません (tabemasen = to not eat)
のむ (nomu = to drink) becomes のみません (nomimasen = to no drink)

To conjugate verbs from their dictionary form to positive, past tense ます form:
It's the same as conjugating to ます form, but instead of ます you use ました (mashita).

たべる (taberu = to eat) becomes たべました (tabemashita = to have eaten)
のむ (nomu = to drink) becomes のみました (nomimashita = to have drank)


To conjugate verbs from their dictionary form to negative, past tense ます form:
It's the same as conjugating to ません (present, negative), but you just add でした (deshita) at the end. でした is past tense version of です (desu).

たべる (taberu = to eat) becomes たべませんでした (tabemasen deshita = to have not eaten)
のむ (nomu = to drink) becomes のみませんでした (nomimasen deshita = to have not drank)

The ます form is pretty simple, and foreigners often learn about the ます form before the dictionary (short) form of verbs. For now until you begin learning how to use short forms, use ます and です so you'll become comfortable with polite speech.