sentence = ['she sells sea shells by the sea shore']

>>> sentence = 'she sells sea shells by the sea shore'
>>> out = ' '.join(map(lambda x: 'like ' + x if len(x) > 1 and x[:2] == 'sh' else x, sentence.split(" ")))
>>> print(out)
like she sells sea like shells by the sea like shore

len(x) > 1 and x[:2] == 'sh'

x.startswith('sh')

import re
sentence = 'she sells sea shells by the sea shore'
out = re.sub(r'\bsh', 'like sh', sentence)