Don't exaggerate your
certainty. If anything, present your ideas as less
certain than you feel they are. If your ideas are really
worth it, your partner will recognize your good ideas and
agree with them. He or she may even forget that they're
yours, but he or she is more likely to act on your ideas when
they are not seen as your ideas.
Use conditionals such as
'this might be worth trying,' 'as a possibility could we,'
'this hasn't been tested but.'
Warning: the first reaction
you are likely to have when you use this pattern is that
nobody is any longer willing to listen to you. Take that
as a sign that you have not been doing much listening to
others if you are so accustomed to having people listen to
your ideas.