"Thank you for inviting me, I need to think it over to come there as it is too far from my location that would be more than 80 Km(approximately). "
"I have(am) doubt to come there." (Note: To write this in uncertainty)
Here is natural Canadian English. Thank you for inviting me, I need to think it over before I come, because it is a long way (about 80 kms). If you say " I need to think it ove r', then you don't need to write about doubts.
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Here is natural Canadian English.
Thank you for inviting me, I need to think it over before I come, because it is a long way (about 80 kms).
If you say "I need to think it over', then you don't need to write about doubts.
The syntax for writing about doubts is eg I doubt that I will be able to come.
Clive