For singular nouns ending in z, change the z to c and add -as
change the z to c and add -es
leave the z and add -es
remove the z and add -es

I’ll you it’s very easy, 12 is good, 13 is the first , 14 first too, 15 is good , 16 is the second one

No favorite at all but inferno is cool

D. si acabo de recibir su mensaje de texto y le voy enviar uno dentro de 5 minutos

I'm not sure if you mean for us to translate or to answer. but i'll translate as these are questions for you to answer. 1. how long has it been since you've read a book? . 2. how long has it been since you've eaten breakfast? . 3. how long has it been since you've talked with your spanish professor?