The idiom "blue collar" refers to manual labor or industrial work. The term comes from the usually blue overalls manual laborers would wear in factories etc
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Most linguists agree that the English language has 12 tenses, sometimes explained as three tenses which each have four aspects. The present tense has four aspects; present simple, present continuous, present perfect, and present perfect continuous. In addition, their are three forms for each aspect, which are affirmative, negative, or a question. Present simple is used to describe facts, routines, or common occurrences. An example of a present simple sentence in affirmative form is \"I go to the store.\" When the subject is \"he,\" \"she,\" or \"it,\" the verb takes an \"s\" or \"es\" ending in present simple tense.
Present continuous tense is used to describe something happening or developing at the moment or an action that has recently finished. It may also be used in stories or to emphasize frequent actions. The affirmative form of the present continuous tense is formed by combining the conjugated auxiliary verb \"to be\" and the present participle form of a verb. \"He is going to the store,\" is an example.
Present perfect tense is more difficult for learners to grasp and relates past events to the present. Some uses include talking about things that happened in the past at an indefinite time, things that happened and are still true now, and things that happened in the past but have an impact on the present. One can make a present perfect tense sentence by adding the auxiliary verb \"have\" to the past participle form of a verb. There are many irregular past participle forms that students should be aware of. To make the negative form, one would add \"not\" after \"have.\" \"I have not eaten pizza in three years,\" is a negative present perfect sentence.
Present perfect continuous is only used to describe ongoing actions that continue from the a specific point in the past or to describe a recently finished activity that had been continuous. The form is similar to present perfect tense, with the addition of the past participle verb \"been\" between the auxiliary verb and the main verb. To ask a question, first use the auxiliary verb \"have,\" then the subject, then \"been,\" and finally the present participle main verb. \"Have you been smoking?\" uses this form.