botton or buckle my belt? and the s in verbs

Anonymous wrote:

Hi, everybody I have few questions. -If I have a belt for pants do I say : "I botton my belt" or I buckle my belt? Belts usually have buckles rather than buttons, so you would normally buckle your belt. -Look at these sentences: Do you know how much a ticket concert  the concert ticket cost? In the sentence above, the verb cost is simple past tense.  The sentence asks whether you know how much someone paid for the ticket.                                         Do You Know How Much It Costs? This sentence asks what the price is. Why in the 1st sentence the verb "cost "didn't take the s and in the 2nd sentence it did?  What are ALL the cases in which a verb takes the s?, What are all the cases in which a verb doesn't take the s?  There is an s at the end of simple present tense verbs in the third person singular in affirmative sentences.  If the sentence is negative or interrogative, you use does+the base form of the verb in the simple present tense (third person singular). Thanks a lot for your time and consideration, take care.