a. The milkman <u>brings</u> milk every morning. The simple present tense of "bring" is 'brings" and it suggests that an action is performed from time to time or continually such as daily, weekly, or monthly.
b. The girls are <u>dancing</u> beautifully. The present continuous tense of "dance" is "dancing" and it is simply used to describe an action that is being performed at the moment (on-going) or an unfinished action.
c. We <u>played</u> cricket yesterday. The simple past tense of "play" is "played" and it is used to describe an action that was performed in the past i.e it has been completed and as such do not extend into the future.
d. We were <u>studying</u> science yesterday. The past continuous tense of "study" is "studying" and it indicates a continuing or an on-going action of the past that extends to the present and future time.
A preposition can be defined as a word that shows or illustrates the relationship between a pronoun or noun and other words in a sentence. Some examples of a preposition used in various literary works in English language are up, below, after, by, against, for, over, at, to, etc.
The main purpose of a preposition as a part of speech is to introduce an object (of, upon), indicate a timeframe (from, by, over), show direction (to, across, along), location or place (at, up, after, below) and to illustrate the spatial or sequential relationship between two or more things, people, place, etc.
<em>Completing the sentence with the most appropriate or suitable preposition, we have;</em>
I. Last week my class went <u>on</u> a field trip to see a play. We sat <u>about</u> six rows back.
II. My teacher let me sit <u>by</u> my best friend. I enjoyed going <u>on</u> a field trip.