A sentence is a group of words that expresses a complete thought. A sentence must have a subject and a verb, but it may or may not have an object.
There are four kinds of sentences.
1. A declarative sentence makes a statement. A declarative sentence ends with a period.
2. An interrogative sentence asks a question. An interrogative sentence ends with a question mark (?) instead of a period.
3. An exclamatory sentence expresses strong emotion. It shows a strong feeling such as surprise or anger. An exclamatory sentence ends with an exclamation point (!) instead of a period.
4. An imperative sentence gives an order.
Use the base form of a verb to give commands or make direct requests. This use of the verb is called the imperative.
Imperatives are a very direct way of telling people to do something. Using do or please before an imperative is more polite.
The subject of a sentence sometimes does something to someone or something else. The person or thing that receives the action is called the object. Verbs that have objects are called transitive verbs.
Verbs with Two Objects
Some verbs have two objects. The direct object receives the action of the verb. The indirect object tells to whom or for whom the action is done. The indirect object usually comes before the direct object. for example.
The thing that Sam gives is ‘a present’, so a present is the direct object of the verb. But there is another object: ‘Anna’. ‘Anna’ is the person that receives the present, so Anna is the indirect object of the verb.
Some verbs don’t have an object. A verb that does not have an object is called an intransitive verb.
A positive sentence tells you that something is so. A sentence that tells you something is not so is called a negative sentence. It contains a negative word like not, never, no, no one, nobody, none, or a negative verb like isn't or can't or won't.
There are two kinds of questions: yes or no questions and wh- questions.
You ask a yes or no question to get yes or no as the answer. Use the verbs be, have or do, or any of the helping verbs, to ask yes or no questions.
In questions, the helping or auxiliary verbs come before the subject of the sentence. When be and have are used as ordinary verbs, they come before the subjects, too.
Wh- questions usually include the verbs be, have, do, or any of the helping verbs.
To ask for facts, use the question words what, which, who, whom, how, when, where. The helping verbs in wh- questions usually come before the subject. So does the verb be when it is used as an ordinary verb.
If the wh- question word is the subject of the question, it comes before the verb. For example: