this is究竟能不能缩写成this's和this'?为什么

this is究竟能不能缩写成this's和this'?为什么 This is a pig,I think.中,This is a pig能不能缩写成 This's a pig .This is a pig,I think.中,This is a pig不能缩写成 This's a pig 还有哪些类似的不能缩写的情形?有没有一定要缩写的情形?这是小学四年级一课一练 this is可以缩写成this's吗? This is 可缩写成 This's 吗? 请问This is 在 This is my teacher 中可以缩写成This's吗? This is可以缩写吗? this is 能缩写吗 This is能缩写成This'is吗?一般来说不能啊! this is not my sister 缩写 this is有缩写形式吗? Whose dog is this 能不能说成 Whose is this dog that is 有没有缩写?this is有没？ which is 能不能缩写 English,is,this,in,Whatl连词成句,不带缩写! 英语介绍别人时,This is 某人,This is 为何不能缩写? This is the photo my family.改为同义句This is my( ) ( ).两个词,可以缩写. This 和is可以缩写吗?急为什么 this is 为什么不可以缩写,而that is又可以缩写