Decide if the following commands is grammatically correct of incorrect.

(tu) no digo mentiras.
incorrect
correct

(tu) no escribas cosas tontas.
incorrect
correct

For this case we have to:

"Yo no digo mentiras (I don't tell lies)"   is the correct form of the first sentence.

The present indicative of the verb "decir" we have:

Yo digo

tú dices

él/ella/Ud. dice

nosotros decimos

vosotros decís

ellos/ellas/Uds. dicen

Thus, the first option is incorrect.

On the other hand we have:

"tú no escribas cosas tontas" is correct, generally used "do not write silly things (no escribas cosas tontas)" knowing that it refers to the second singular person.

From the present subjunctive of the verb "escribir" we have:

Yo escriba

tú escribas

él/ella/Ud. escriba

nosotros escribamos

vosotros escribáis

ellos/ellas/Uds. escriban

Option A: Incorrect

Option B: Correct

the right answer is c. tiempos

el partido de fútbol tiene dos tiempos

in english, this translates:

a football match has two halves

these halves cosists of 45 minutes each.   each half runs continuously. on the other hand, there is usually a 15-minute half-time break between halves.  

si no tengo dinero necisto _911 para hacer una llamada   english: if you dont have money call 911