Página — Uerakua Anapu Uantakua Projects And Readings 2 (pág. 116)

Present Perfect Tense

Affirmative subject + auxiliary verb have/has + past participle + object or complement I have completed all my homework.

Negative

subject + auxiliary venb have/has + not + past participle + object or complement She has not taken chemistry.

Interrogative auxiliary venb have/has + subject + past participle + object or complement + ? Have you penformed an experiment?

Note: The adverb ever expresses the idea of an unidentified time before now. It also means anyfime.For example: Have you ever had surgery? No, I have never had any surgery.

1. Individually, write on the line for or since to complete each sentence correctly.

a):The use of oximeters has been increased 2019 because of the pandemic.

b) Doctors study years to become professionals in their field.

c)The incubator has been used more than 144 years.

d)Has the doctor been in a surgery ten hours?

e)International Nurses Day has been celebrated on Florence Nightingale's birthday (May 12).1965.

f) My sister has worn an arm sling two months because she broke her arm.

g)I have studied medicine I finished high school in 2022.

h) In my community there have not been any doctors more than five months.

i)Has your brother taken pills he was diagnosed as hypertensive?

j) I have consulted with the doctor about my treatment I was diagnosed with the flu.

Grammar

I have been a nurse for ten years. Shows amount of time.
I have been a nurse since 2014. Shows when an event started.	Since

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