Phillip Bennett (2008) proposes a mechanism explaining increased silica solubility in the presence of two small organic acids. As you prepare a literature review, where your job is to describe the work of others in concise, analytical terms.As a rule, you should try to choose active verbs in the following circumstances: Active verbs-whether in present or past tense-are especially meaningful as you describe work that another author or you have completed or are in the process of completing. In technical writing, learning to deploy active verbs on the page is one of the most obvious and easiest ways to improve your style. For the reader, "Cheswick dealt with" or "Figure 4 shows" are far less meaningful than "Cheswick hypothesized" or "Figure 4 represents." As always, you should choose exact words in favor of nonspecific ones, especially when you can use an active verb. Much to the reader’s frustration, "deal with" and "show" are often merely thinly disguised excuses for much more active analytical verbs such as theorize, suggest, imply, propose. Yet these words convey no analytical meaning at all and are barely informational. Even in journal articles, these verbs put in a shocking number of appearances and return for many unsolicited encores. However, the more these verbs are used in a particular paper, the more meaningless they become. We feel enticed by generic all-purpose verbs such as "deal with" or "show," which on the surface can sound snappy and technical. (You can change the verb by clicking one of the green buttons.When composing, we often automatically make lazy choices, especially when choosing verbs. The tables below show all 12 tenses so you can see the simple past tense among the other tenses. (Using "for" is a common way of describing how long an activity lasted.) Her daughter hid under the bed for three hours.("Last week" tells you when it happened and for how long.) Last week, the council inspected the drains.("Just before he was caught" tells you when the activity took place.) Just before he was caught, the burglar considered using the fire escape.The Martians landed near the aqueduct on Tuesday last week.Read more about commas with adverbial phrases. A comma is not usually used when the adverbial phrase appears at the back of a sentence. When any adverb appears at the front of a sentence, it is usual to follow it with a comma. Other examples are"Yesterday," "Last year," "Before breakfast,". ("On Tuesday last week" tells you when it happened. On Tuesday last week, the Martians landed near the aqueduct.The simple past tense is often seen with a time expression explaining when the activity took place or how long it lasted.Įxamples of "when an activity took place": The Simple Past Tense with Time Expressions
If the verb ends, change the "y" to an "i" and add "ed":įorming the Simple Past Tense of Irregular Verbs If the first syllable of a longer verb is stressed and the verb ends, just add "ed": If last syllable of a longer verb is stressed and ends, double the last consonant and add "ed": If the final consonant is w, x, or y, don't double it: If a verb of one syllable ends, double the final consonant and add "ed":
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