You need to first check if the Arabic font you have used contains English glyphs/characters.
If it does not, you English words would appear as small rectangles with a cross and pink background indicating missing glyph.
Thank you very much for your reply.
Actually, I still beginner inDesign user, could you please if possible explain the steps more simple
Thank you very much
Step 1. Choose another font for English text.
It can't be any more simple.
As Aman mentioned, the font you ought to use should have Arabic glyphs as well as English glyphs. Try Arial, Adobe Arabic, or Times new Roman to name some.