You may never have used the verb "cost" correctly.

Thursday, February 18, 2016
 Consider this: "The National library that Obasanjo built costed several billions of naira." Sorry, the verb "cost" is an irregular verb and should not take on"+ed" in any case whatsoever. NB: Irregular verbs are those verbs in English that do not change or accommodate the "+ed" and "en"markers for their past tense and past participle tense. Hence, it is: "cost/cost/cost e.g. "The National library that Obasanjo built cost several billions of naira (not "costed")." Many have always been caught guilty of this. I hope to come up with more of such irregular verbs, over the days.