Subject is the doer. In other words, subject is a verb maker even a verb creator. Without using a subject in a sentence, the sentence can not be called or named or defined as a sentence. It is because a subject is a core-element of a sentence beside a verb. Both a subject and a verb must be used to make a good sentence.
Perhaps, some of you still doubt about this and submit your problem like an example below!
Please Marry me!
or,
From the sentence above, when we read it at a glance, we will find that there is no subjects at the sentence. But when we take a look at its detail, the subject exists. Both sentences are command expression which have a subject, that is, /You/. In other words, subject /you/ is always used in the expression as well as in prohibition. So, why is the subject (You) is not placed and used there. Because the subject which is used is always /You/, Without placing the subject the expressions will still be understood or understandable. But when the subject is used in the expressions, the addition of the subject gives us a stress in meaning.
Perhaps, some of you still doubt about this and submit your problem like an example below!
Please Marry me!
or,
Be deligent!
From the sentence above, when we read it at a glance, we will find that there is no subjects at the sentence. But when we take a look at its detail, the subject exists. Both sentences are command expression which have a subject, that is, /You/. In other words, subject /you/ is always used in the expression as well as in prohibition. So, why is the subject (You) is not placed and used there. Because the subject which is used is always /You/, Without placing the subject the expressions will still be understood or understandable. But when the subject is used in the expressions, the addition of the subject gives us a stress in meaning.
From the title above, perhaps, you think that the title is to radical. But, Here, I would like to stress the point of this discussion where I should place the subject as its real and actual existance.
Subjects interfere other words, specially a verb either lexical-meaning verb or Structural-meaning verb. In this discussion we will see that a subject can change the existance of the verbs and other words in line with the subject types appeared.
In Positive Verbal Simple Present Tense, Subject /he/, /she/ and it makes few changes to the present verb, that is, suffix /-s/ or /-es/ must be added or placed behind the verb.
For examples:
I attend the meeting every day.
She attends the meeting every day.
This also makes us use the auxilliary in Verbal Present Simple, like:
(+) I live with my grandma.
(-) I don't live with my grandma.
When the subject is changed into /he/, /she/ or it, it becomes:
(+) She lives with .....
(-) She doesn't live with .....
Besides, Still in Positive verbal simple present tense, the subjects (/he/,/she/ or /it/) forces the verb /have/ must be changed into /has/.
For examples:
They have an apartment.
She has an apartment.
Subjects also interfere the changes of /be/ in Nominal Simple Present and Nominal Simple Past.
For examples:
Nominal Simple Present:
She is a lawyer.
I am a lawyer.
They are lawyers.
Nominal Simple Past:
I was late yesterday.
She was late yesterday.
They were late yesterday.
Now, please think about it and discuss with your group to make a conclusion about How many kinds of words or patterns can be interfered by the subjects!
Good luck!