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A past tense

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A past tense (abbreviated PST) is a grammatical tense that places an action or situation in the past of the current moment (in an absolute tense system), or prior to some other event, whether that is past, present, or future (in a relative tense system).[1] Not all languages mark verbs for the past tense (Mandarin Chinese, for example, does not); in some languages, the grammatical expression of tense is mixed with the expression of mood and/or aspect (see Tense-aspect-mood). In English, there ar
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  A past tense (abbreviated  PST ) is agrammatical tensethat places an action or situation inthe past of the current moment (in an absolute tense system), or prior to some other event, whether that is past, present, or future (in arelative tensesystem). [1] Not all languagesmark verbs for the past tense (Mandarin Chinese, for example, does not); in somelanguages, the grammatical expression of tense is mixed with the expression of moodand/or aspect(seeTense-aspect-mood). In English, there are two verb forms which are commonly called past tense , the so-calledsimple past, sometimes misleadingly called the preterite, which is a true tense, and thepresent perfect, which is generally considered anaspectrather than a tense. [1][2] Thesecombine with other aspects including theprogressive (continuous) aspectto createseveral additional forms: Simple past is formed for regular verbsby adding -d  or  – ed  to the root of a word.Examples: He walked to the store , or  They danced all night. . A negation is produced byadding did not  and the verb in its infinitive form. Example: He did not walk to the store .Question sentences are started with did  as in Did he walk to the store? Simple past is used for describing acts that have already been concluded and whose exacttime of occurrence is known. Furthermore, simple past is used for retelling successiveevents. That is why it is commonly used in storytelling. Past progressive is formed by using the adequate form of  to be and the verb’s presentparticiple: He was going to church . By inserting not  before the main verb a negation isachieved. Example: He was not going to church . A question is formed by prefixing theadequate form of  to be as in Was he going? .Past progressive is used for describing events that were in the process of occurring whena new event happened. The already occurring event is presented in past progressive, thenew one in simple past. Example: We were sitting in the garden when the thunderstormstarted. Use is similar to other languages' imperfect. Present perfect is formed by combining have/has with the main verb’s past participleform: I have arrived  . A negation is produced by inserting not  after  have/has : I have not arrived  . Questions in present perfect are formulated by starting a sentence with have/has : Has she arrived? Present perfect is used for describing a past action’s effect on the present: He hasarrived. Now he is here . This holds true for events that have just been concluded as wellas for events that have not yet occurred. Present perfect progressive is formed by prefixing have/has before thegrammaticalparticiple  been and the verb’s present participial form: We have been waiting  . A negationis expressed by including not  between have/has and been : They have not been eating  . Aswith present perfect simple, for forming a question, have/has is put at the beginning of asentence: Have they been eating?  Present perfect progressive is used for describing an event that has been going on untilthe present and may be continued in the future. It also puts emphasis on how an event hasoccurred. Very often since and for  mark the use of present perfect progressive: I havebeen waiting for five hours / I have been waiting since three o’clock. Furthermore, there is another version of past tense possible: past perfect, similar to other languages'pluperfect.  2 smar ttien.blogspot.  com I. TUJUAN PENELITIAN 1. Mengenal susunan sel pada Allium cepa, Rhoeo dishcolor, danManihot utilisum. 2. Mengetahui bagian-bagian sel tumbuhan.3. Mengetahuisusunan

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