I have had breakfast.是什么现在完成时还是过去完成时?

I have already had breakfast.怎么改为否定句? I have had breakfast.是什么现在完成时还是过去完成时? I will have breakfast When I __ my breakfast,I shall ring her up.为什么用have had 英语HAVE HADyou would have had time for breakfast.If I had had time这两句话当中的HAVE HAD 都分别做什么成分啊, After I __ my breakfast,I went outside to play with my friends.A had B have had C have D had had应该选哪个?为什么? 请问：I have had my breakfast 请问：为什么这个句子要用“have had”,had 是“have”的过去式,为什么用两个“have”呀? __ you __ (have) your breakfast,Linda?Yes,I had it just now. I have already had breakfast 这句话改为特殊疑问句,怎么改? I have bread for breakfast. I have rice for breakfast. i have no breakfast翻译 I had （ ）big breakfast ( )this morning I had breakfast at home.意思 I tool a quick shower and ran to the bus stop without__(having ,had,to have,has)breakfast They started immediately when they ( )breakfast.A.hadB.had have C.have hadD.had had 1.you your breakfast?Yes,I it at school.A.Did; have; had B.Have; had; had C.Have had D.Did; have; have had2.Mom,I must to go school at once.By the way,I the cat.A..have fed B.fed C.will feed D.am feeding3.I have watered plants but I haven’t fed the I _____ my breakfast when the morning post cameA、was having B、had been having C、had D、have been having