but these have not had any effect 及句型.为什么中间有一个had

These TV sets have gone up in quality, but have not risen in price.but,后主语为什么可以省略 but these have not had any effect 及句型.为什么中间有一个had To Have,But not to these have not had any effect Not I have dropped,but you have. 英语翻译Choose three realistic scenarios and apply the Logotherapy to these situations.These different areas colud include,but are not limited to the following:An actual situation you have personal knowledge of...A situation you have read about i but,these books are not mine .急,马上就要 Jasper has put up no parking signs outside his gate,but these have not had any effect.为什么前后两句都用完成时. Sir,I'm sorry for not finishing my homework on time,but I have been very busy all these days.----N----Sir,I'm sorry for not finishing my homework on time,but I have been very busy all these days.----No excuse for it,but I_____ drop it this time.A mig Not much love,but i have left, 翻译But it does not have to! Our hands have met but not our Could not help but have to have the fate but not luck can not but与 have to 区别 we h ___that these children can have a happy holiday 英语翻译Love is enough though the world be a-waning,And the woods have no voice but the voice of complaining The fear shall not alter these lips and these eyes of the lover Jasper has put up no parking signs outside his gate,but these have not had any effect.Jasper has put up no parking signs outside his gate,but these have not had any effect.逗号前这句是什么时态?后面的这句应该是现在完成式的否