Dialogues

1. 我是在网上订的。Wǒ shì zài wǎngshang dìng de.
I booked it online.
我 wǒ, means I.
是 shì, is. 
网上 wǎngshang , online.
订 dìng, book.

2. 中国杂技是世界一流的。Zhōngguó zájì shì shìjiè yīliú de. 
Chinese acrobatics are world-class.
Acrobatics is a pearl in the treasure house of the traditional Chinese performing arts. Chinese acrobatics has a long and rich heritage.中国杂技是世界一流的. 
中国 Zhōngguó, China.
杂技 zájì, acrobatics.
是 shì, is.
世界 shìjiè, world.
一流的 yīliú de, top-grade.
中国杂技是世界一流的. Chinese acrobatics are world-class.

3. 现场表演的效果完全不一样。Xiànchǎng biǎoyǎn de xiàoguǒ wánquán bù yíyàng.
The effect of a live show is totally different.
现场 xiànchǎng, spot, live. 
表演 biǎoyǎn, performance.
效果 xiàoguǒ, effect.
完全 wánquán, totally.
不一样 bù yíyàng, different.

4. 我能跟您合个影吗？Wǒ néng gēn nín hé gè yǐng ma?
May I take a picture with you?
能 néng, could. 
跟 gēn, the first tone, means with.
您 nín, the polite form of 你.
合个影 hé gè yǐng, to take a picture together.
吗 ma, a particle indicating the question.
能跟您合个影吗? May I take a picture with you?