请问下列句子那里有错?(每句只有一处)
1.ifweknowmoreaboutgivingthefirstaid,wemayhelppeopleinanemergency.
2.adrownedmanisscreamingforhelpintheriver.
3.knockeddownbyacar,hewasbledtodeath.
4.help,thebabypischokedonsomecandy!
5.mypenhasrunoutofinks.canyoulendmesome?
第三个问题中我打醋了,应该是“is”,不是“pis”