Sentence:  Now the only way in which all curves of the image family of * * f can pass through a fixed point is to <WSD>have</WSD> a generator of * * f which is not a secant but a tangent of \ g , for then any point on such a generator will be transformed into the point of tangency . 
Meaning of the word marked with <WSD> tags:  have or possess, either in a concrete or an abstract sense