1   i
2   want
3   to
4   go
5   home
6   .

7   i
8   love
9   cars
10   .

testfile=open("/Users/desktop/testset.txt").read().split('n')

for line in testfile:
    if not line.strip():
            continue
    index,word= line.split()
    if index == "1":
        testlines.append(sent)
        sent=['<s>', word]
    else:
        if word == '.':
            sent.append('</s>')
        else:
            sent.append(word)