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Modal verbs are used to express the speaker's attitude or feelings. They can imply different levels of certainty and they can change the formality and meaning of the main verb. There are nine true modal verbs: will, would, should, shall, might, may, must, can and could. Modal auxiliary verbs don't have tense, they don't use do and don't in questions and negative sentences and don't have -s in the third person singular. There are other verbs that are called semi-modal verbs because in some ways they are formed like modal verbs and in other ways they are like main verbs. The passive voice is formed by moving the Object to the first place, conjugating the verb be in the same tense as the verb in the active form and using the past participle of the main verb. Phrasal verbs are grouped in intransitive, transitive separable and transitive inseparable phrasal verbs. A clause is formed by a subject and a verb. Clauses can be independent, dependent or relative. Relative clauses can be defining or non defining clauses. Defining relative clauses define the meaning of the sentence unlike non defining relative clauses which don't alter the meaning of the phrase. After reading this unit I have understood how modal verbs may be confusing to non native speakers.