How can I unite some elems in the list?

[buran]

lst = ['did', 'is', 'not', 'come', 'will', 'kill', 'are', 'not']
def new_element(item):
    return  item[0] if item[1] != 'not' else ' '.join(item)
new_list = [new_element(x) for x in zip(lst[:-1],lst[1:]) if x[0] !='not']

# ALTERNATIVE, NOT VERY PYTHONIC ONE-LINER
new_list2 = [item[0] if item[1] != 'not' else ' '.join(item)
             for item in zip(lst[:-1],lst[1:]) if item[0] !='not']

print new_list
print new_list2