Question

GRAMMAR 

4 

Complete the sentences using the First Conditional. 

Your foot ................................................... (be) fine if you ................................................... (not walk) on it for three weeks.  

If Mike ................................................. (not make) an appointment, the doctor ................................................. (not see) him.  

I ................................................... (not take) a tablet unless this tea ................................................... (not help). 

If Amy’s sore throat ................................................... (not get) better soon, she ................................................... (not come) on the trip. 

5 

Match A to B. Then complete the sentences with the verbs in brackets. Use the Second Conditional. 

     A 

If he took a tablet, 

Matt would become a doctor 

If my dad ..................................... (not have) a meeting, 

Your health ..................................... (improve) 

You’ve got a temperature. If I were you, 

             B 

     ..... a if you exercised more.  

     ..... b I ..................................... (not go) to school today. 

     ..... c he ..................................... (not feel) so bad. 

     ..... d he would take me to the dentist.  

     ..... e if you ..................................... (encourage) him to study hard. 

6 

Choose the correct answer. 

I won’t go unless you come / came with me. 

If he knew the results, he  wouldn’t hide / won’t hide them. 

If I am / were you, I wouldn’t tell Andy. 

If you climb that tree, you will feel / would feel dizzy. 

Dad would be angry if he sees / saw you. 

7 

Complete the sentences with the verbs in brackets. Use the Third Conditional. 

If I ................................................... (not eat) so much, I ................................................... 

(feel) sick. 

Her back ................................................... (be) better if she ................................................... 

(not lift) that heavy bag.

He ................................................... (not arrive) late if he ................................................... 

(leave) on time. 

If we ................................................... (know) about Dan’s allergy, we ................................................... (help) him. 

If he ................................................... (listen) to the doctor, 

he ................................................... (not need) an operation. 

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Answer 1

Respuesta:

Explicación:Los virus se reproducen dentro de las células vivas del huésped y usan la maquinaria celular para sintetizar su propio genoma y demás componentes. Para lograr entrar a las células, han desarrollado una variedad de mecanismos para introducir sus genes y proteínas a las células …

Los virus se reproducen dentro de las células vivas del huésped y usan la maquinaria celular para sintetizar su propio genoma y demás componentes. Para lograr entrar a las células, han desarrollado una variedad de mecanismos para introducir sus genes y proteínas a las células …