Business English: A Practice Book by Rose Buhlig

_needs_--_needed_ a tariff to protect home industries. =Exercise 108--Principal Parts= No one can be certain of using the correct form of a verb unless he knows the principal parts. Some verbs are regular; that is, they form their past tense and their perfect participle by adding _ed_ to the present tense; as, _Present_ _Past_ _Perfect Participle_ walk walked walked Some verbs, however, are very irregular, having a different form for each of the principal parts. A list of such verbs follows: _Present_ _Past_ _Perfect Participle_ arise arose arisen awake awoke or awaked awaked be was been bear (carry) bore borne beat beat beaten become became become begin began begun bid bade bidden bite bit bitten blow blew blown break broke broken choose chose chosen come came come do did done draw drew drawn drink drank drunk drive drove driven eat ate eaten fall fell fallen fly flew flown forbid forbade forbidden forsake forsook forsaken freeze froze frozen give gave given go went gone grow grew grown hide hid hidden know knew known lie (to rest) lay lain ride rode ridden ring rang rung rise rose risen run ran run see saw seen shake shook shaken show showed shown shrink shrank shrunk sing sang sung slay slew slain slide slid slidden sow sowed sown speak spoke spoken spring sprang sprung steal stole stolen strive strove striven swear swore sworn swell swelled swelled, swollen swim swam swum take took taken tear tore torn throw threw thrown wear wore worn weave wove woven write wrote written =Exercise 109= Some verbs, though irregularly formed, have the past tense and perfect participle alike. A list of such verbs follows: _Present_ _Past_ _Perfect Participle_ bend bent bent behold beheld beheld beseech besought besought bind bound bound bleed bled bled bless blessed, blest blessed, blest bring brought brought build built built burn burned, burnt burned, burnt buy bought bought catch caught caught cling clung clung clothe clothed, clad clothed, clad creep crept crept deal dealt dealt dig dug dug dream dreamed, dreamt dreamed, dreamt dwell dwelt dwelt flee fled fled grind ground ground hang hung, hanged hung, hanged have had had hear heard heard hold held held kneel knelt knelt lay laid laid lead led led leap leapt leapt lend lent lent pay paid paid say said said shine shone shone sit sat sat sleep slept slept sling slung slung speed sped sped spin spun spun stand stood stood sting stung stung strike struck struck string strung strung sweep swept swept swing swung swung teach taught taught think thought thought weep wept wept win won won wind wound wound wring wrung wrung =Exercise 110= Some verbs have all three forms alike. A list of such follows: _Present_ _Past_ _Perfect Participle_ bet bet bet burst burst burst cast cast cast cost cost cost cut cut cut hit hit hit hurt hurt hurt knit knit knit let let let put put put rid rid rid set set set shed shed shed spread spread spread sweat sweat sweat wet wet wet FOOTNOTE: [1] If one of the words so joined is plural, the verb should be plural. =Exercise 111= Choose the correct form of the italicized words below, and give the reason for your choice.