Bu plan mantıklı.

Breakdown of Bu plan mantıklı.

olmak
to be
bu
this
plan
the plan
mantıklı
reasonable
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Questions & Answers about Bu plan mantıklı.

What does bu mean and how is it used here?
bu is a demonstrative pronoun meaning this. It points to something close to the speaker. It doesn’t change for gender or number; to say these plans, you would say bu planlar (keeping bu and making the noun plural).
Why is there no verb like to be in Bu plan mantıklı?
Turkish normally drops the present-tense copula “to be.” Instead of saying “is,” you simply juxtapose the subject and the predicate. If you want to be more formal or emphatic you can add the suffix -dır to the adjective (mantıklıdır), but in everyday speech Bu plan mantıklı is perfectly complete.
How is mantıklı formed?
mantıklı comes from the noun mantık (logic) plus the adjective-forming suffix -lı (“with”). So it literally means “with logic,” i.e. logical. The suffix follows vowel harmony, appearing as -lı, -li, -lu, or -lü depending on the last vowel of the stem.
Why is plan exactly the same as in English?
plan is a loanword (ultimately from French or English). Many modern concepts entered Turkish unchanged or with minimal adaptation. As a result, plan is spelled and pronounced very similarly to English.
Turkish usually dislikes consonant clusters. How can plan start with pl?
Loanwords often preserve their original clusters. Native Turkish words may insert a vowel to break up difficult clusters, but borrowed terms like plan, program, or strateji typically keep the same consonant combinations they had in the source language.
Why doesn’t plan have a case ending here?
In a simple nominal sentence (subject + predicate adjective), the subject stays in the nominative (plain) form, so plan has no additional ending. Only objects or indirect objects receive accusative, dative, etc.
How do you form a question from Bu plan mantıklı?

Add the question particle (with vowel-harmony adjustments) right after the adjective:
Bu plan mantıklı mı?
That literally means “Is this plan logical?”

How would you express the opposite, i.e. “This plan is illogical”?

Use the negative adjective form mantıksız (“without logic”). So you say:
Bu plan mantıksız.

How do you pronounce the Turkish ı in mantıklı?
Turkish ı is a close back unrounded vowel [ɯ]. It’s produced with the tongue high and back but without rounding the lips. It’s different from the dotted i ([i])—so mantıklı is [man·tɯk·ɫɯ].