Negative Tú

Negative Tú refers to anything negative or something you don't want
For Example Tener = no tengas
1)locate the verb

2)Put the word in its singular form

3)change the ending appropriate to gender

4)place no at the beginning of the word

Preterite verbs vs Imperfect verbs

Preterite Verbs are actions verb that take place in the past
Preterite verbs have different endings to imperfect verbs
Example
(yo): miré
(nosotros): miramos
aprendí aprendimos
escribí escribimos
(tú):miraste
(vosotros): mirasteis
aprendiste aprendisteis
escribiste escribisteis

(Ud.):miró
(Uds.,): miraron
el, aprendió ellos, aprendieron
ella) escribió ellas) escribieron
MANY ENDINGS WILL REPEAT THEMSELVES LIKE IR & ER

Imperfect also take place in the past tense but are used as a refrence for the past events or dates
(yo) jugaba

(tu) jugabas

(Ud.) jugaba

(nosotros) jugábamos

(vosotros) jugabais

(Uds.) jugaban

(yo) hacia

(tú) hacias

(Ud) hacia

(nosotros) haciamos

(vosotros) jugabais

(Uds.) hacian

Usted and Ustedes

Usted and ustedes like negative tú commands,
and are used for both affirmative and negative commands.
To create an usted command: form of yo, drop the - o, add the opposite ending. Think of the present tense yo form of the verb you want to make into an usted command, then drop the - o ending and add the él, ella, usted ending normally used for the opposite kind of verb.
If it ends in -AR for usted add -E. If it ends in -AR for ustedes add -EN.
If it ends in -ER or -IR for usted add -A. If it ends in -ER or -IR for ustedes add -AN.