Merging multiple tables without duplicating IDs using SQLite

I am working on search interface and my problem is that the ids are all duplicating making the searched word go wrong. How can I merge multiple tables without duplicating ids?

Example:

Table1

_id   ques   long
1     hello  tung
2     ask    bung
3     bun    hot

Table2

_id   ques   long
1     hind   sling
2     scent  pong
3     brun   jit

Table3

_id   ques   long
1     pont   rave
2     sue    lace
3     brun   bass

The output should be like this

_id   ques   long
1     hello  tung
2     ask    bung
3     bun    hot
4     hind   sling
5     scent  pong
6     brun   jit
7     pont   rave
8     sue    lace
9     brun   bass