Non-native English speakers often have difficulties in choosing between two different prepositions, articles, or other parts of speech. In this series of blog posts, we aim to help making the right decisions.

In a Day vs. On a Day

In a day or on a day? What’s the difference? And what about on the day? In a day means in the duration of a day (24 hours). The expression is used when an event or action happens within the duration of a day. Here’s an example: * Suzy

On Line vs. In Line

Wait in line. Wait on line. In line or on line? Which is the correct expression to use in this situation? And that answer would be… It depends on what region you are from. Wait in line is common in most regions of the US, while Wait on line is

On Behalf vs. In Behalf

On behalf or in behalf? Which is right? They are actually both correct expression but differ in meaning. However, even native speakers of English can get the two confused, so let’s see what each actually means. In behalf of means “for the sake of” or “for the benefit of.

On vs. In

On and in are two of the most common prepositions in the English language. But how do you know when to you one or the other? Are you in the train or on the train? You use the preposition in when you are inside a space or object, and you

Do Not vs. Does Not

Who don't know where India is? → Who doesn't know where India is? In the example above, using doesn't (does not) is correct.

Has Not vs. Have Not

They has not been going to class these days. → They have not been going to class these days. Has or have? This is similar to the is vs. are dispute (refer to the article Is vs. Are []). Here is a simple rule to follow: A

Would vs. Will

Would is the past tense of will. The sentence above should be in all present tense as implied by the present tense has. If sentence used had instead of has, then using would would be correct.

Is vs. Are

Is follows singular nouns while are comes after plural nouns. Here is an example. * Jerome’s reports is not good. → Jerome’s reports are not good. In the example above, reports is plural (report is the singular version of the word), so the appropriate verb for the sentence would be

Though vs. Although

Although was once two words: all though. So the root meaning of the though and although are the same, but although is a bit more formal than though. Generally native speakers of English would prefer to use although in writing and though when speaking casually.