using "and" as a conjunction

[ida2]

In each following example, which sentence is correct? If none, please let me know the correct form.

Mental institution has found that depression diagnosis remained underestimated and has recommended further screening.
OR
Mental institution has found that depression diagnosis remained underestimated and recommended further screening.
………………….
Depression rate is about 1% annually and it is still increasing regarding the changes in people’s lifestyle.
OR
Depression rate is about 1% annually and is still increasing regarding the changes in people’s lifestyle.

 

[PaulQ]

"using "and" as a conjunction"
This is wrong because it is tautologous - and can only be used as a conjunction, and therefore "as a conjunction" is redundant.
"Using and"

I think you are asking how a coordinating conjunction affects the subject and verb of subsequent clauses.

(All your sentences have mistakes in them - none are correct. Institution, rate, and diagnosis are all singular countable nouns, and all singular countable nouns require a determiner (a/an,the, this, that, my, any, etc.) as a modifier. There are also other mistakes.)

"And" is a co-coordinating conjunction: it joins two equal clauses:

The dog has eaten the meat.............and.............it has drunk the milk.
..........[main clause 1].................conjunction...........[main clause 2]

The dog has eaten the meat and the dog has drunk the milk.
The dog has eaten the meat and it has drunk the milk.
The dog has eaten the meat and has drunk the milk.
The dog has eaten the meat and drunk the milk.

You will see that it is usual to omit both the subject of the second clause and "to have" in the second clause. This is also true in sentences that have multiple clauses:

The dog has eaten the meat, drunk the milk, and gone for a walk." -> note that "eaten", "drunk" and "gone" are all past participles.

The same is true of "to be" (is) in equal clauses that both have the continuous form of the verb:

"He is singing and dancing in the rain."

 

[ida2]

"using "and" as a conjunction"
This is wrong because it is tautologous - and can only be used as a conjunction, and therefore "as a conjunction" is redundant.
"Using and"

I think you are asking how a coordinating conjunction affects the subject and verb of subsequent clauses.

(All your sentences have mistakes in them - none are correct. Institution, rate, and diagnosis are all singular countable nouns, and all singular countable nouns require a determiner (a/an,the, this, that, my, any, etc.) as a modifier. There are also other mistakes.)

"And" is a co-coordinating conjunction: it joins two equal clauses:

The dog has eaten the meat.............and.............it has drunk the milk.
..........[main clause 1].................conjunction...........[main clause 2]

The dog has eaten the meat and the dog has drunk the milk.
The dog has eaten the meat and it has drunk the milk.
The dog has eaten the meat and has drunk the milk.
The dog has eaten the meat and drunk the milk.

You will see that it is usual to omit both the subject of the second clause and "to have" in the second clause. This is also true in sentences that have multiple clauses:

The dog has eaten the meat, drunk the milk, and gone for a walk." -> note that "eaten", "drunk" and "gone" are all past participles.

The same is true of "to be" (is) in equal clauses that both have the continuous form of the verb:

"He is singing and dancing in the rain."

Thank you SO much for your detailed explanation That was so helpful.
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