The place of determiners 'that' and 'which' in a sentence

To be ‘at a crossroads’ defines a moment of confusion, indecision or turning point. There are certain words in the English language that lead us to situations similar to those that individuals at a crossroads find themselves in. Interestingly, many of those adept in the English language get them wrong from time to time. Such words include ‘that’ and ‘which’.

Note that while ‘crossroads’ appears to be in the plural form, the determiner ‘a’ precedes it. As an idiomatic expression, there is no variation to the word ‘crossroads’ and that the sentence construction determines whether it takes the singular or plural form. For example, “John (a Christian) was at a crossroads regarding his wedding to Fatuma (a Muslim)”.