Simple past tense

Note the appropriate changes in verb tense. Before you do the work, you might use the present or future tense writing about somethingthat hasn t happened yet. During the lab, since you are supposed to write what you ve actually done just after the time you ve actually done it, a simple past tense is sufficient. 

The simple past tense is used. Both the active and passive forms are acceptable The rats were dosed daily from day 6 to 17 of gestation. or We dosed the rats daily from day 6 to 17 of gestation. are equally acceptable. 

The simple past tense is also used for this section, e.g., Three rabbits aborted. ... 

Has been is the present perfect form of the verb is. However, the first phrase, From 1947 to 1956, tells us that the action took place in the past. This sentence requires the simple past tense, were. 

Simple past tense is correct for stating what was done, either by others or by you. 

Present and simple past tenses may both be correct for results, discussion, and conclusions. 

Simple past tense is correct for stating what was done, either by others or by you The solutions were heated to boiling. The spectra were recorded. Jones reviewed the literature and gathered much of this information. We recently found that relativistic effects enhance the bond strength. The structures were determined by neutron diffraction methods. ... 

Present and simple past tenses may both be correct for results, discussion, and conclusions The characteristics of the voltammetric wave indicate that electron transfer and breaking of the carbon-iodine bond are concerted. The absence of substitution was confirmed by preparative-scale electrolysis at a potential located at the foot of the voltammetric wave. IR spectroscopy shows that nitrates are adsorbed and are not removed by washing with distilled water. ... 

The precautions that have been observed while performing the experiment be recorded at the end in the first person singular (past tense). All records in practical note-book be made with lead-pencil. The diagrams should be simple and will labelled. 

It seems simple enough—the past tense represents action that happened in the past. Often, -ed is added to a verb and, voila Your word is now in the past tense. There are exceptions galore, however, and special nuances that you will need to learn. 

Let us consider a simple example where we wish to disambiguate the token read which can encode the past tense word read-past, pronounced /r eh d/ or the present tense/infinitive word READ-PRESENT, pronounced /r iy d/. In this case, our label set comprises two labels such that L = l = READ-PAST,/2 = READ-PRESENT. If we now consider some example sentences ... 

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