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What are positive and negative effects of antibiotics?

Modern medicine is positive in the ability to cure many conditions and diseases that were incurable in the past. A negative aspect of it is the cost. Technology has improved the quality of care at a cost.


What is the meaning of the verb -could have done?

See the link to conditional statements. "Could have done" is the positive form of a past conditional.It is unfortunate that John was not given the assignment; he could have done it extremely well.The positive aspect of the verb is that John is capableof doing it. The negative form would be ...he couldn't have done it. The situation described happened in the past and is not in the present or future. The conditional aspect is reflected in the fact that he was either given the assignment, or he was not. In this case he was not. Even though we know now that John was not given the assignment, we express events conditionally to reflect the possibility as it existed in the past.


What the simple past tense of to watch negative?

positive - I watched TV last night. negative - I didn't watch TV last night. Notice how the verb changes to the base form and the did not (didn't) is past in negative past simple sentences.


What if TORCH Test igm negative igg positive?

As far as i know IGG positive means you had infection in the past and IGM negative means u r not infected currently.


What is the past tense of express?

The past tense of express is expressed.


What is the past participle of the word express?

Express is a regular verb so the past and past participle are the same:expressed


What is the past participle of doesn't?

doesn't doesn't have a past participle.Doesn't is the negative form of do. It is used to make negative sentences with third person singular subjects or singular noun subjects.She doesn't like kimchi. - negative sentence third person pronoun subject.The dog doesn't like kimchi - negative sentence singular noun subject.The past participle of do is done. The negative is haven't done or hasn't done.She has done gymnastics for years. - positive sentence using past participle of do.He hasn't done gymnastics since last year. - negative sentence using past participle of do.Answer:Didn't.


What does historical aspect mean?

From a past perspective


What is the past tense positive?

Positive is not a verb, so it does not have a past tense.


What is the past negative of sit?

Never sat. Never is the negative part, and sat is the past tense of sit.


What is the past tense of must?

You can use "had to" to express obligation in the past.


What is the expression of simple past tense?

it express events, and simple past tense has 2 formation d/ed! and express actions.