et al ie and eg in Latex

When writing a paper, it is common to use et al., i.e., e.g.. However, in Latex, you cannot simply use the forms "i.e." or "e.g." These words end with a period and Latex will treat the period as the end of a sentence. Thus extra space is added automatically. To prevent the extra space in Latex, the correct use of these words is

• i.e.\
• e.g.\
• et al.\

For example, "...two colours, i.e.\ red and blue."