Syntax is generally checked by the programmer.

Semantics is the responsibility of the programmer

Semantics is checked mechanically by a computer.

Both Semantics is the responsibility of the programmer and Semantics is checked mechanically by a computer.

SLR parser is more powerful than LALR

LALR parser is more powerful than Canonical LR parser

Canonical LR parser is more powerful than LALR parser

the parsers SLR, Canonical LR, and LALR have the same power

syntax of if-then-else statements

syntax of recursive procedures

whether a variable is declared before its use

matching nested parenthesis