I am trying to sweep two merged sections across these eliptical shapes and its not return a smooth sweep.
homework 3.gh (87.0 KB)
homework 3.gh (87.0 KB)
Hi, @Zarif_Abrar!
Well…I’ll mention not all your sweep sections intersect your rails 
And that you’ll most likely continue to have questions about sweep for the rest of your modeling career.
Also, rule of thumb: never upload your entire grasshopper definition, as you did (unless it’s short and sweet); only upload the internalized stuff you need help with. Sorry, but I do appreciate you grouped the ‘problem area’, though, that helped!
In the meantime, notify if this* helps:
homework 3.gh (91.5 KB)
*As workaround, I’ve ‘forced’ your elliptical rails to make contact with your sections, plus a tweak to accommodate for Sweep2 instead.
Cheers,
RC
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is there any way to make it conform more to my previous rails? because this solution creates a large offset from the original ellipsis that I was trying to sweep across
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I believe so, one way* below, with bad results 
homework 3-conform-lines.gh (95.7 KB)
*‘Snapping’ your non-touching sections (line pairs) to their corresponding rails (ellipses) isn’t a big hassle, the problem is that Sweep1 is still grasshopper sweep, and it does whatever it wants!
Also, my ignorance impedes a better explanation, I apologize. However, I can tell you that the errors in the grasshopper sweep result do not occur when I bake the ‘conformed’ lines and perform the sweep manually in Rhino. In fact, the sweep that got skipped (bottom) does work without a problem manually. This just leaves us with more questions 
Hopefully someone with higher skill or troubleshooting knowledge can assist! Or maybe we’ll think of a workaround overnight.
Best,
RC