Когда ставить has to а когда have to

Has to пишется когда he,she,it
have to в остальных случаях( they,i,we,you)

Has- he, she, it.
have- you, l, we, they.

Science - a living organism , which develops the truth .True and legitimate aim of all science is to endow human life new inventions and riches.People using science to fix the imperfection of his nature.Scientific approach - is primarily a certain style of human activity , has a mind that is a proven ability to distinguish from the unproven , the true from the false.Science - is an art to raise questions so that they could receive accurate answers ; is the art of confidence.Make science knowledge , logically connected to the system and imbued idea.

Science - a living organism , which develops the truth .True and legitimate aim of all science is to endow human life new inventions and riches.People using science to fix the imperfection of his nature.Scientific approach - is primarily a certain style of human activity , has a mind that is a proven ability to distinguish from the unproven , the true from the false.Science - is an art to raise questions so that they could receive accurate answers ; is the art of confidence.Make science knowledge , logically connected to the system and imbued idea.