The obligation pattern: verb + তে + হবে.
Second Grade · Level 10 of 15
Handle a real emergency and read a warning sign.
The last hard conjuncts — জ্ঞ (read 'ggo', not 'jn'), হ্ম (read 'mm'), স্ম, প্ত — plus the ৃ kar and the rare vowels ঐ ঋ. ঔ is rarer still; you have already met it in ঔষধ, the formal spelling of ওষুধ. After this level nothing on a sign is unreadable.
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The obligation pattern: verb + তে + হবে.
Then: থানা কোথায়? (where's the police station).
The -কে marks who is called; in speech it's usually dropped — পুলিশ ডাকেন.
Painted on wet floors, road works and truck bumpers.
The spoken thank-you that actually lands. কৃতজ্ঞ is for letters and speeches.
Heads every noticeboard in the country. জ্ঞ is read 'ggo'.
The monument at Savar — road signs point to it. Official English romanisation is 'Jatiyo Sriti Soudho': স্ম here is read 'sr', not 'sm'. Your ৃ specimen.
There is no blue-plaque scheme here — Department of Archaeology boards read সংরক্ষিত পুরাকীর্তি.
Painted on bus windscreens. হ্ম is said 'mm'. Read this and you can read any of them.